This is driving me crazy. I am using the system variable, "$$cpInfoCurrentSlideLabel$$" but my slide names are longer than 15 characters.
How do I change the default limit to a much larger number? I have forgotten this.
Found the answer. Boy that is certainly an annoying unproductive way to change the default.
Essentially, the only way to change the value is at the point of inserting the variable.
Instructions here: http://forums.adobe.com/thread/847978
If it's any consolation...we all feel your pain and have raised this issue with Adobe several times. Feel free to put in an enhancement request using the link on this forum site so that you add your voice to those of us wanting this 'feature' changed.
I will lock this thread since it is not relevant anymore. Since 4 years the default length is 50 characters.