My Blackberry Device Manager has always been very ropey and now it has failed completely.
Always, both with my old 7290 and my current 8800, it used to take 6-8 attempts before DM would open properly and allow me to back up or download new software. But it worked in the end and as I didn't use it that much, I tolerated it. But now either it simply won't let me in at all, and gives me an error message saying it needs to close down, or lets me in, but then says I have no device connected, when I have.
The version of DM I am using is 4.2.1, that came on a disk with my BB 8800, so it should work. I have uninstalled and re-installed it, that makes no difference. I have tried a different USB cable and USB port, that makes no difference.
I have seen some troubleshooting advice on the FAQs for this error message, but I don't seem to have the file it suggests deleting or renaming, so cannot act on it.
Any advice please?