[SOLVED] MGA4 Dropbox not working (not nVidia problem).

As far as I can tell this isn't the nVidia driver problem - hence the title.
.I just did a fresh install of Mageia #4. I noted the already reported errata and problems with the nVidia driver and problems with KWrite and Dropbox not starting etc.
I found I had the nVidia driver installed which is why KWrite failed.
Found the empty file /etc/pkcs11/pkcs11.conf. Deleted file, as stated in Errata, using root.
Chose noveau graphics driver, re-booted.
KWrite now started.
Downloaded Dropbox #1.6.0-1 RPM from Dropbox. Installed. Dropbox starts (appearing in taskbar for about 4 seconds and then disappears).
Went through a series of un-installs/re-installs/re-boots, even using the Dropbox listed in the non-free repositories (Dropbox #61.6.0). all to no avail - same result!
I don't know where to go looking for how to tell why this is failing. I try to use journalctl, but don't really know what I'm doing. I installed rsyslog (more familiar) and that doesn't tell me anything either as far as I can see!
Stumped!
.I just did a fresh install of Mageia #4. I noted the already reported errata and problems with the nVidia driver and problems with KWrite and Dropbox not starting etc.
I found I had the nVidia driver installed which is why KWrite failed.
Found the empty file /etc/pkcs11/pkcs11.conf. Deleted file, as stated in Errata, using root.
Chose noveau graphics driver, re-booted.
KWrite now started.
Downloaded Dropbox #1.6.0-1 RPM from Dropbox. Installed. Dropbox starts (appearing in taskbar for about 4 seconds and then disappears).
Went through a series of un-installs/re-installs/re-boots, even using the Dropbox listed in the non-free repositories (Dropbox #61.6.0). all to no avail - same result!
I don't know where to go looking for how to tell why this is failing. I try to use journalctl, but don't really know what I'm doing. I installed rsyslog (more familiar) and that doesn't tell me anything either as far as I can see!
Stumped!