As the IceTV firmware module is, as far as I am aware, identical on the 7100+, 2400/2460 and the 5300/5310/5320 I would expect the same vulnerability. Another possibility, that I mentioned on the Topfield forum, is my system ID of is 32030? If you the Toppys have have system ID 32031 there could be differences which explain why I am not having problems.
I am running firmware December 2013 (1.10.00) whereas those with the issue are running Feb 20 2012 and Sept 26 2012 firmware. My recollection is that both 2012 firmware run the current version of the Topfield IceTV module.
There are numerous reports of LCNs getting scrambled, even multiple entries, when uses have done service scan for the introduction of 7flix and/or 10HD. Also for those regions that now getting the equivalent of 9HD. This issues has been noted with more recent firmware than that being considered here. Although I have a dim recollection that I had problems with one of my 7100+ units.
Ian