Sorry to hear that you are unable to update one of the linked component which is working fine when you link it with a new file. It looks like the component got corrupted in that particular file. Could you please try to recreate the component and then relink it to the same file?
I've already deleted component in destination file, updated without any problems and dropped into design from scratch... Luckily this time had only 9 instances (w/ modifications), but what if would fail something else..like the one with 40+ instances?
Thank you for your advice, but.. Recreating component is not the solution - ppl like me spends hours to set everything in their designs. Who will pay them for recreation of all of that? I mean my example above with 40+ modified instances. Sometimes its easily 100+ (like buttons or inputs).
Its becoming bit frustrating because I lose tons of time for fixing things. This time I lost 1,5h to find solution and fix it. Last time autosave corrupted my file so had to download last version. - lost 4hrs...I have to charge client for "unexpected problems with Adobe"...