Using VEXCode IQ (V 2.4.5-15), we were dragging a WHILE block (fairly large) when the entire block turned grey. Don’t know why this happened and cannot find any reference in the documentation/forum as to what this means and how to recover. They were able to drag the grey block around, drop it back into the stack, etc. They could pull blocks out of the WHILE at which point the extracted blocks returned to their former colors. In fact, if all of the blocks inside the WHILE are pulled out, they return to their original color, with the WHILE (now empty) remained grey. If blocks were re-inserted into the greyed WHILE, the re-inserted blocks would then turn grey. Guessing there is a problem with the greyed WHILE.
With this apparent corruption, we were not comfortable continuing and the guys dropped back to a backup and continued work. We’d be interested as to why this happened and if there is a way to recover.