I searched for this issue and didn't see anybody's report on this so if it is already reported, nevermind. When editing dialog text/string, I edit the string and return to dialog and the only thing that is visible is the name of the string, not the contents of the string. Restarting InstallShield seems to correct the problem and the install seems to run fine.
I've also seen this, but the workaround I've found isn't nearly so dramatic. If you just click elsewhere (the Behavior, a different language dialog), then back to the dialog, it's resolved the contents of the string. A bit irritating, but not crippling.
