albums won't open after update

I am also having problem with the redirection. My homepage is not appearing anymore, instead this plugin is redirecting homepage to first album in list. ;(
My albums are having more than 500 images each.

This is very weird. Have you tried to flush the rewrite rules? You can do so by going to Settings > Permalinks and click the Save Changes button. (see it in action: https://www.youtube.com/watch?v=ILem-7yhD_s).

I would like to hear from both of you if this works.

PS. My response is a bit delayed, I had no time this week. Apologies, but I develop this plugin and give support for it in my spare time.

I did. but it was even getting a bigger mess

No problem on response hope we can figure it out

@djansen1987

Can you post the contents of your .htaccess file (in the root directory of your WordPress installation)? The problem might be there somewhere.

I have found another thing: the current album links are /otst m/album-name/. But in the menu, you will be redirected to /otstm/album-name. It seems that the menu creator strips out whitespaces. But the links on /albums are right. So there is a kind of configuration error/plugin collision.