I get this error
Exception during ShowTaskBar: List index out of bounds (n)
n - a number (for instance 13)
I seems to happened after I lost a connection to a DB and after it warned me that it would close a tab (I had several) due to object non existence (a annoying thing…it should give the option to save at least!)
after reconnect I got that error anytime I tried to open a new tab for editing a package by double clicking a package in the DB explorer.