Not sure if this is a known issue or not, however I have noticed in Gravity Forms 1.5.2 that when you submit a form with a number of backslashes in a textarea (e.g. field being used to submit a file path) it removes all but the first backslash, however I have another WordPress environment with Gravity Form 1.5 installed and this issue does not occur there, seems to only affect 1.5.2.