From: hooploid on
Sometimes my files get corrupted and show rollups of SOME tasks on SOME bars,
and the Format\Layout... options don't fix it. Once a file gets this way,
it's always "broken."

Solution: In Format\Bar Styles... delete any row that has "Rollup" in the
name. Then uncheck the "Always roll up..." option under Format\Layout...

You won't be able to see rolled up bars anymore, but I never use them anyway
since they're always on top of each other.