CB

The PMS plugin has an element of pms.mypmspro when using SEF this gives the following URL.

/cb-profile/pluginclass/pms.mypmspro

It's possible SEF is failing to reverse due to the period in the plugin element. The plugin element may need improvement to remove needing a period.

https://www.joomlapolis.com/forum/255-developer-members-support/239990-how-to-disable-the-new-private-messaging-feature?start=12#308261
https://www.joomlapolis.com/forum/153-professional-member-support/240085-messaging#308593