I experience a bug since I updated to version 3.24 or 3.25.

After every reboot a dialog pop ups to let me choose which SIM to use for Textra. One of the two options is greyed out and cannot be selected, so I just select the one available option for the pop up to disappear. My phone, Nexus 6, is NOT a dual SIM phone. When I uninstall Textra and use the standard messaging app the pop up to select a SIM does not appear after a reboot.

I am on cyanogenmod 13 (cm-13.0-20160820-SNAPSHOT-ZNH5YAO0J7-shamu.zip). Let me know if you require any additional information.