This is with v1.0 in P3Dv4.5

I did noget an INVALID ENTRY when entering 62, or 62C.

Every time I enter a number between 50 and 99, without adding a C to it, it enters fine, and the D-TO is entered as XX ^oC (i.e. 63 ^oC D-TO). But...

If I added the F to the number, providing the number was 59 to 99, it is entered with the ^oF added (i.e. 64F  entered as 64 ^oF D-TO).
The one strange thing I did notice, was that only the even numbers worked (of those I tried between 66F and 74F). i.e. 66F, 68F, ... 74F.
Entering the odd number, it added 1^o to the entry. i.e. 65F would enter as 66^oF, etc.
Entering 59F I got 59 ^oF D-TO.
When I entered 60F, it entered 61 ^oF, 61F would also enter as 61^oF. 62F, and 63F would enter as 63^oF.
64F entered as 64^oF.
65F, and 66F would enter as 66^oF, etc.. I tried this up to 74F.

So all in all, I'm getting the D-TO somewhat okay.