Error category selection backend

[LeonZ]

I upgraded Virtuemart and have a little problem selecting the right category for certain products. The problem appears when you have a category with 3 characters or less. This category can't be found because the searchbox only appears when you have typed 4 characters or more. So when you have a category called bug you never can add any products to it.

[LeonZ]

It how ever is a very annoying problem but no one else seems to have the problem. I have alphabetical categories also and they are called for example a-b or c-d and I cant call these also. Might somebody have a solution for this then feel welcome to tell me please.