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I am working on a Mindstorms NXT project. Due to annoying bug (cannot find terminal hotpoint thingy) I can't delete a specific block, and if I do so, part of the program will be cut off from the main sequence. I deleted that block and the bug happened, and not knowing what happened, I saved it. I reopened it to find out that part of the program was cut from the main sequence and I tried searching the whole empty space but wasn't able to find it.

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Is there any way of retrieving the lost blocks (other than searching) since the file size is still the same, meaning the lost blocks are just lying around somewhere.

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I have had this problem in the past, and have not been able to find a solution, other than program it with the software meant for programming EV3s, as it is backward compatible (except that Bluetooth doesn't work, so that may be a problem as your photo shows Bluetooth blocks). Hope this helps!

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Unfortunately, it's difficult/impossible to fix your program once the bug has occurred. You'll have to recreate the program from scratch (i.e. delete the file and start over).

There are a few ways to avoid this going forward:

  • Save often. If the bug happens, DON'T overwrite your file! Revert to the previous save.
  • Don't resize the white LEGO liftarm thing manually unless you have to. Always let the software decide the spacing between your blocks.
  • Make sure you're using the latest version of the software (NXT-G 2.0). Download it here.

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