Thank you Wilfried.
"Did you try to stop and start /.../ MPE on the desk top?" Yes I did, several times (I have no phone besides my trusty old K530i). But yesterday, pending an answer from you, I simply uninstalled and reinstalled MPE - and voilà! It now it works perfectly again.
I had seen, in Task Manager, that certain processes relating to MPE, were still running despite closing the program and despite reboots so something was not right...who knows what/why - I don't care as it is now running fine again.
"Since I migrated to Windows 10, it seems to me, I also see above error message more often." Well, I am still running Windows 7 as I prefer to let other people be Microdorks unpaid beta-testers of version 10 for a few years before, and if, I switch.
Remember the Vista debacle? I avoided that because of all the negative press and am happy I didn't install it.
Windows 7 is fine with me; the best Windows so far I think, and I began using 2.0 once, and DOS before that...
In the meantime, after MPE conked out and I reinstalled it, I tried the few phone managment programs there are (I was
thoroughly done with toy software Sony PC Companion) and I discovered that there is nothing that compares, by even a long shot, to MPE for its many smooth-working features and its well thought-out design
Kudos to you at FJ Software; next time I am in funds I will donate some more. You certainly deserve it.