[Analogus]

Your first problem:

Look a view posting above. That's the problem quisvir mentioned. It should be corrected for the 650 in my custom builds. Try it out, you can revert any time as you know. But you see, they are custom builds which could (very seldom) have problems.

Your second 'thing':
For intermediate steps in font sizes you need to choose other CSS-files. E.g. Droid-1 instead of Droid-0. If that doesn't work, try annother EPUB-file. Some ebooks (epubs) aren't able to change that simple way. That's why I wrote 'in most cases...'.
That sounds cumbersome, but if you assign a button or user gesture to do this (PRS+ options in custom build) that's very quick. I use it every day!

For example: choose font size S. Make it slightly lager? Choose annother CSS. ...-0 is smallest, ...-1 lager and ...-2 largest.
Next font size would be M with ...-0.

I do it that way (there is no other way round) since lots of weeks - you'll get used to it.

In short:
Try annother ebook and look if that works.

A.


Edit: I forgot to ask:
Did you use 2.0.17 for changing the CSS-file?

If so, it's indeed a bit cumbersome to change the CSS-file (that's why I love the custom builds):

1) close book
2) change CSS-file over PRS+ options
3) open ANOTHER book
4) close it
5) open the old one

You have to REOPEN the old book. That's what it means. In custom build that's not necessary. The PRS+ team is making good work and progress in this great little gem of software.