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This article or section documents something not included in the current version of Scratch (3.0). It is only useful from a historical perspective. |
The Scratch 1.4 Flash Player had many bugs before its discontinuation in 2013. This article lists many of them, along with the status "resolved," "technical limitation" or "unresolved"; and what to do if they occur. One could report unlisted bugs here.
Scratch Program Evaluation Bugs
These bugs are bugs about how the Scratch code is evaluated, and how it differs from the Java Player and Scratch Program's player.
 Note: | Note that when providing workarounds for features which differ in the Java and offline players, the offline player is given priority. |
Description:
Actions can occur in the wrong order, for example a sprite may sense if it is touching a line before the line is drawn.
Status: Technical Limitation
This is due to speed optimizations. Add the script
wait (0) secs
wherever one needs to refresh the screen/order.
Description:
Many instruments and drums do not sound as they do in Scratch 1.4
Status: Technical Limitation
None. Flash's instrument library is not as extensive as Java's is.
Description:
The broadcast message scratch-startclicked does not trigger scripts with a "when green flag clicked" hat block.
Status: Won't Fix
This was never an official feature and will not be implemented.
Description:
Sprites with the rotation style set to left-right facing may have an offset rotation center.
Status: Unresolved
None.
Description:
Variable placement is often off.
Status: Unresolved
Saving the project with all monitors visible in the right places may help position them properly.
Description:
Clicking the green flag signals a mouse-down event
Status: Unresolved
Checking the coordinates of the mouse when the event is toggled, and making sure the Y position is less than 180, will avoid this.
| Note: | Scratch 1.4 triggers the mouse-down event, too, but the Java Player does not. |
Description:
Sprite dragging does not work properly.
Status: Unresolved
The following script makes a sprite draggable:
when Sprite1 clicked:: control hat
set [x v] to ((mouse x) - (x position))
set [y v] to ((mouse y) - (y position))
repeat until <not <mouse down?>>
go to x: ((mouse x) - (x)) y: ((mouse y) - (y))
end
Description:
Color sensing does not work when sprites are being dragged.
Status: Unresolved
The above patch allows that.
Description:
Variable monitors occlude speech bubbles.
Status: Unresolved
The following script prevents that:
when gf clicked:: control
reset timer
repeat until <(timer) > (1)> // change 1 to the number of seconds
say [something]
end
when gf clicked:: control
wait (0.5) secs
show variable [var v]
Description:
Speech bubble text overflows in full-screen mode.
Status: Unresolved
Split long speech into smaller dialogs. For example, use
say [Hello! This is a] for (2) secs say [very long string. I am] for (2) secs say [the Scratch Cat.] for (2) secs
instead of
say [Hello! This is a very long string. I am the Scratch Cat.] for (2) secs
Description:
Dragged sprites appear over the gray bar over the viewer.
Status: Technical Limitation
None.
Bugs
These bugs refer to the player itself, bugs about how the player may glitch, freeze, hang, etc. in various situations.
Description:
Punching each pixel in a region forms a translucent region rather than a solid one.
Status: Unresolved
Use a larger pen size (this may cause the image to be smudged) or do not lift the pen after drawing each pixel.
Description:
Opening multiple projects in different tabs can cause sounds to hang and skip.
Status: Technical Limitation
Close the other tabs or at least hit the stop button on the player in the other tabs.
Description:
The viewer seems to queue actions when it is not on the viewing screen. When viewing the screen, all the actions play quickly.
Status: Technical Limitation
This is a Flash feature, and there is no Flash command to empty the queue if it is too long.
Description:
You cannot use keyboard/mouse features until you click on the viewer.
Status: Technical Limitation
This is a Flash safety feature and cannot be avoided.
Description:
Graphic effects (except for the ghost and brightness effects) cause the player to slow down significantly.
Status: Partially Resolved
Use version 11.7 instead.
It seems to be partly fixed for single effects.
| Note: | This affects not only the Flash player on Scratch, but also Flash-based programs throughout the Internet, as well as some offline programs that use Flash. This one originated with the removal of the "pixel blender" command in Adobe Flash 11.8. |
Description:
Editor right click menu still appears in the player.
Status: Unresolved
This does not happen when using Google Chrome's Flash Player.
Description:
Some sounds from 1.0 projects are static.
Status: Unresolved
Downloading the 1.x project and opening with Scratch 1.x plays fine.
Description:
As of 11/8/16, the Scratch Team has reported updating the Flash version to above 23.0.0.185 due to a serious security exploit on Windows operating systems.[1]
Status: Technical Limitation
Updating to 23.0.0.208 will prevent this from occurring. This issue also does not affect other operating systems like Mac or Linux. However, note that you cannot do this on Windows 2000 and below Mac OS X 10.9.
Resolved Bugs
Description:
Pen Punching (pen up then pen down) does not work at all.
Status: Resolved
None.
Description:
When medium or low quality is used, very low pen sizes are not drawn at all.
Status: Resolved
None.
Description:
Zero and blank are indistinguishable to the equals operator.
Status: Resolved
None.
Description:
Stage monitors for lists are confused when lists are resized.
Status: Resolved
None.
Description:
Variables/reporters in the "When () > ()" hat block makes the project not work.
Status: Resolved
None.
