Change to '\t' delimiter in Matlab 15

Was there a change in Matlab 15a or b with the way matlab interprets the '\t' delimiter? I'm trying to run some older code and am getting some errors with how the delimiter is choosing which columns to look at in my data. I'd prefer not to go back and resave every old file to make it interpret-able within matlab.

[Steven Lord]

Is there a particular function about whose behavior you're asking?

What is the full text of the error message or messages you're receiving?