i found this bug when i added 10x the same digital output port in the virtual robot screen (for each led on the place i wanted), then i tried to delete one, worked. but then i tried to delete another one, bam, a just in time error. description in the image: (dutch)

which basically says: index out of range.

luckily windows gave me the option to continue and the program still worked fine after hitting continue.

edit:

software version: 2013.1.12.00