Upgrade to 1.5 required ?

Hi

I have just re-installed portable apps after my USB key "broke" (it's the one thing I don't backup !)

This includes pFF and pTB, both of which are at 1.5
When I run both and added extensions both stated that an upgrade to 1.5 was available.

Am I missing something obvious ?
I chose no in both cases as they are already 1.5.

Is then an issue in letting pFF upgrade it's self (are the files not compressed differently or something) ?

Thanks

Ross