A couple of quick observations:

- it doesn't seem to be auto-enabling Fn for number fields

- the numbers in the selected unit remain at zero after a conversion, which is a bit confusing.

For example, I'll select Length, then Meter, and enter a value of 1.0 at the top. The rest of the fields will become populated with the conversion results, but 'meter' in the list will remain at 0.0. A small quibble, but it's a bit odd as you scroll through the list.

- it seems to lag quite a bit more than I remember

Otherwise it's a staggeringly useful conversion app -- thanks very much for all the work you've done