I noticed it after yesterday's training - I was running v2.2.1, don't recall the build. I thought an update might help so I downloaded the latest CAB, which turned out to be v2.2.2 B967, but same results whether I look at yesterday's training or one from a month ago.
I haven't opened a training report on my PDA for awhile, and yesterday when I did, both the speed and altitude graphs were blank. This is the same for the small (PDA) and big format reports.
Maybe something to do with the start time fix??
Running v2.2.2 b967