What I can tell you is, I use Blazer, and don't have any problems with it.
The major issue I had with TextPlus was that it caused my RescoBackup to reset upon completion. Being that I backup at least once, sometimes twice a day, and only use Blazer perhaps once a week, the backup issue was my major problem.
However, that being said, it (RLock) may have solved a problem with Blazer that I just wasn't as aware of (I do recall some soft resets when I'd use Blazer in the past, but none since installing RLock and locking TextPlus)
Hey, RLock is FREE... just install it, lock TextPlus and see if it solves your problem! You can lock other programs as well...