Google Photos app terminating right after start

[GoodOndra]

I am having issues with my Google Photos app since a few versions back on my HTC One M7. Right after I open the app, the photos miniatures start loading only for the app to terminate once they do. Sync also doesn't work very well and only some of the pictures taken are uploaded.

I have already tried to clean up the device, uninstall the app, reboot it etc. All to no effect. Has this happened to anyone else? Any ideas for further troubleshooting and fixing this...?

Thanks!