RE: After installing the most recent Connections update v8.6.8 I have been experiencing issues with multiple plugins.
Do you recall what version you upgraded from? There has not been any significant changes since the 8.6 update released in March and those changes were largely focused on working specifically with the address data when reading/displaying an entry. All the 8.6.x updates since then have been minor bugfixes and tweaks. None of the changes would cause so many conflicts.
RE: File Manager
There are two plugins with this name at wp.org with this name. I installed them both and both seem to work fine … as long as both are not activate at the same time. When both are active the one throws and error about not being able to connect. Looks like both plugins use the same library to manage files so they are conflicting with each other. Do you by chance have both installed and active?
RE: All-In-One WP Migration
I installed and activated. Didn’t configure anything, simply exported to a file. It did a 2GB backup in just a couple minutes. So that seems to work fine. Are you having trouble with exporting using a specific destination?
RE: Ultimate Member
I already have this installed on my test site so I activated it. I only have the default forms created but the setting for each field do load as they should.
RE: User Insights
Looks like this is available for purchase only so I can not test. But based on testing so far It seems like it would work fine too.
RE: DIVI Builder
I just did a custom job a couple weeks ago where the theme was Divi and used the Divi Builder and I did not notice any issues with using it. Was there something specific that timed out? I personally only have an older version of Divi so what I can test is limited.
Overall things seems to work fine with the plugin listed. Did you by chance do any other updates to other plugins or the theme at around the same time in noticing these issues? What was your testing methodology which indicated that Connections was the cause?