I updated to 2.91 seemingly without issue. The meters started acting erratically but I didn't see the pattern. I rebooted, they worked fine.
But after a while of playing and editing on a patch, the output meters were a couple seconds behind synch with the sound. If I don't play for a few seconds, the meters will die to nothing. If I hit a chord, they don't move until a few seconds later. I can't say whether the lag is constant, but it's at least a couple seconds. The compression meters on the LA comp were acting similarly with a big lag.
Changing presets doesn't change the problem.
On further investigation, meters on the output of Path 1 are fworking fine. It's only the meters on the output at the end of the 2nd path that were delayed. The compressor was in the B path.
I deleted most of the blocks in the 2nd path, including the delay and compressor. The output block on 2 still showed delayed, the output on 1 was still fine.
I added a compressor into Path 1. It's meters registered fine. The meters on the output of path 2 were still lagging real time.
I rebooted the unit. No output meters would register at all. But the meters on the compressor on path 2 were working correctly without lag.
I changed from snapshot view to signal routing view. The meters suddenly displayed, but were lagging. The meters on the compressor on path 2 were now also lagging.
I rebooted. The meters on path 2 were lagging by only about 1/2 second, as were the compressor meters. But the meters on the output of Path 1 were fine.
If there is a specific test you want me to do, let me know.
