I've noticed the "lock up" on the stat screens for VV and FT but have found that patience always fixes it. If it looks like it froze, I just let it sit for a few minutes, walk away, do something else and when I go back, the stats have updated and everything is fine.
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My VV2 story, "A Twist of Fate"
And don't miss Krystal's stories, all three of them!
"Life is too fast... unless you're in traffic."