new and very frequent crashes version 3.6,2

I've been using 3.6.2.548021803 revision 3224f34 under Windows 10 for several months at least with no issues. Roughly two weeks ago I suddenly started getting frequent crashes when editing scores, doing simple things like adding a note, adding an accidental to an existing note, or editing a chord symbol. By "frequent" I mean after creating/editing two or three elements: this is so frequent that the program is more or less unusable. The only clue I can point to is this: In normal operation when placing a series of notes with the cursor, there is a moveable blue note at the cursor position. When that note is placed down it remains blue and another moveable note appears; when that second note is placed down the prior note turns from blue to black. When the crash happens, no second moveable note appears after placing the first note, and the first note remains blue. At this point the only thing that can be done is close the program. When this problem appeared I'd not made any changes to the program for several months, at least that I'm aware of. Could this be somehow related to a windows update? Thanks for any help.