RE: Thanks for trying to help, but I think you do not understand my problem.

I think I do, though it seems rather minor, if it's a glitch at all...

RE: I am well aware how to delete a filter, but that is not the problem. 

Oh, so Find works fine then?  I didn't get that from your initial post because you wrote, "Therefore, I can't search for anything that does not include that account.."  Can't generally means something is blocking you from continuing.

So you're simply noting that in some cases it opens with the account filter set, and wondering why? If so, it may be context sensitive, depending on the active window, the way other features are in QuickBooks. That's what I'd guess, except you asserted "Find Function retains old filters" , which find doesn't do. So, with that assertion in mind, it makes sense that the Find window wasn't closed after your last find, as then when you brought it to the front of your lists of windows, it will appear as you last left it - with your old filters set.

Here's my suggestion: To test it for awhile, before pressing Ctrl-F to open Find, check the open windows list to make sure Find isn't already open. Or, use another method to make sure, like closing all widows first. Then press Ctrl-F and see if it ever comes up with unusual default filters.