Firstly, thank you for the suggestion D-iivil, I did this and rebooted for good measure, but the Theme Customizer still halts after the 'fasten seatbelts' message. It also seems to be taking far too long working on making the updates before reaching the reboot stage, which of course are not 'sticking' anyway. And no problem about the comment on where I posted, I was in two minds about here or in Theme Customizer thread.

Thank you Saturn for your reply. I installed CSSUFC with HAM but removed it with FAPman due to all the dependencies. The message was just that the package was dependent on the other packages noted in my earlier post. Would it be worth re-installing with HAM and then removing again with HAM?

I'm linking the inability to use Theme Customizer with the installation of CSSUFC but this may be unrelated. I had been avoiding accepting updates from the AwOken icon pack because I don't like the icon used for making a call ( I replaced it with the stock icon ). After removing the package in conjunction with removing CSSUFC I will now be on the latest version. AwOken now includes a little UI to update the icon set outside of Theme Customizer, but this does not seem to work either.

All of the settings in Transitions Tuner are greyed out with the exception of App menu blur. I had previously selected options from TT before installing CSSUFC and these were selected but greyed out until I removed CSSUFC and all the relevant packages. Since reinstalling them, the options are no longer selected. I currently do not have CSSUFC installed.

Being non-Linux and fairly noobish, I'm not sure how to generate logs, or indeed which logs you might find useful.