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- This article is about bugs in Scratch itself. For bugs in computer software, see Bug.
There are many notable bugs in Scratch. Some may just be graphical, some might impact coding, some might make text missing and some might show extra things.
Wrong Font Bug
In the Scratch 3.0 Paint Editor, sometimes the Sans Serif font displays as a larger Serif font. There is no known cause and solution for this bug, but the workaround is to use the Chinese, Japanese, or Korean fonts instead, as they all look very similar to the Sans Serif font.
No Last Post Bug
- Main article: No Last Post
In May 2017, when spammers were active, on some occasions the "last post" field next to a subforum description would be missing. Though it died down after a while, later changes to the forums seemed to bring it back. The reason why this happens remains unknown.
Disappearing Comment Bug
- Main article: Disappearing Comment Bug
Mainly found in Scratch 3.0, this bug causes profile, project, or studio comments to not show when attemping to view it. Sometimes, when the message for the comment is clicked, the comment section will not load. Then, if a user tries to view the page where the comment is without the direct comment link, the comment will not be shown. This can cause the inability to view, reply, delete, or report the comment. To fix this, do a hard refresh.
- Main article: Trending Glitch
Currently found in Scratch 3.0, the trending glitch is a way of getting one's project shown in the trending category of Explore without the project actually qualifying for "trending" status. Unsharing and then resharing projects utilizes the glitch by making the Scratch website believe that the reshared project received however many loves and favorites the project in question had before the reshare in a short amount of time when in fact the project had technically already had those loves and favorites before it was even shared. As a result, the project is shown as "trending."
Percent Custom Block
Found in the Scratch 3.0 project editor, naming a custom block "%" will result in Scratch not letting you press "ok." After pressing cancel, there will be a mass of random blocks at the top of the block selector.
As of March 2021, in Scratch 3.0, comments are sometimes duplicated. Sometimes, Scratchers will send 1 comment, and after posting the comment, see that they sent 1 comment, and leave the page.[clarify] Other Scratchers see it as 2 entirely same comments. This often results in Scratchers reporting the user and comment for spamming.
|This article or section documents something not included in the current version of Scratch (3.0). It is only useful from a historical perspective.|
- See also: Flash Player/Bugs
Disabled Keyboard Bug
This bug, seen only in Scratch 2.0, caused Scratch to not react to key presses, which impacted projects that needed key presses to work and meant that Scratchers couldn't program, due to most blocks needing to have words typed in them to work correctly. This bug was only seen with Firefox. There were, at the time, no ways to fix it forever, but it had been found that clicking outside Scratch (such as address bar) fixed it temporarily.
- Main article: Semicolon Glitch
Disappearing Text Bug
- Main article: Disappearing Text Bug
The Disappearing Text Bug was that text in some projects would disappear. It was seen in blocks with written text inside or dropdown menus. In some cases, only some text would disappear, but sometimes, almost all the text in the project would disappear. It has been fixed, and although it was reported to have appeared again in Scratch 2.0, it hasn't been seen for a few years.
Variables Not Fully Hiding
In Scratch 2.0, sometimes, variables did not completely disappear from the Stage when hidden via the checkbox next to its name. The exact cause is uncertain, but it is speculated that quickly switching costumes or backdrops caused it.
Speech Bubbles With Empty Space at the Bottom
ln Scratch 2.0, when changing to fullscreen, the outside of a speech bubble got amplified the correct amount, but the text appeared a bit smaller relative to the bubble. The result was that the speech bubble was a bit taller than it was supposed to be. This only happened with speech bubbles with lots of text, or large speech bubbles.