I've been running the current version of fx on ptr (even fighting bosses) and it's worked fine for me :S, can't speak to the tier bonus though as I've been using the 5.4 tier, although when I tested the old tier on dummies it seemed to work fine. Thanks for the update anyway, it's awesome the community is there to keep it alive. Maybe it's in a part I'm just not using? (i only track sw:p/vt for the re-cast indicators, nothing else)
While we're on the topic of fx though, one feature that I've always wanted to see implemented is the ability to have multiple frames to track different things. Currently you can set-up the multiple frames, so the feature must have been planned, but they're just duplicates of the first. Any setting changes in the other frames have no effect (unless I'm missing something.)
If anyone could get that to work it would allow for some pretty sick fx layouts being able to fully separate current target, focus, other targets, cooldowns, procs, whatever you want really, all with their own visual settings and white/blacklist. That being said there's probably a reason the feature never got properly implemented, I can't imagine it'd be easy to code, at the very least the config file size would mulitply in size pretty quickly.