It may also be helpful to know what specific code Inventory Grid View was using that caused the problem, as while I am loath to admit it, I have not been using this most excellent addon of late, yet have been having the same problems with occasional insecure code errors double-clicking items in the inventory or transferring to the bank.
Since it is totally random and can work for literally hours before failing, tracking down what addon is having the same problem is difficult, though if it helps, here are the ones I am using ATM:
Slowly working my way through my own projects to make sure they aren't contributing to this, however I have already eliminated the insecure hooks Master Recipe List made into bags for the tracking icon.
Will have to take a look at Show Motifs but I think that is the only other one I contribute to that touches bags.