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Why do some command in IDA have red text highlight around them? e.g. enter image description here

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According to HexRays IDA support, this means an error. In IDA help (press F1), under the Problems List header you have the list of possible problems encountered during analysis. In your case it seems to be BADSTACK, which means:

The value of the stack pointer at the end of the function is different from its value at the start of the function. [...] The most probable cause is that stack tracing has failed.

You will see each line causing this problem in the List of problems window.

The description how to fix this problem is included in the IDA help as well, below the problem description.

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