I tried both the latest stable and unstable builds, and I consistently get an error. I need to give a bit of background info first.

I used Palm Pilots for as long as I can remember, and I build a fairly large collection of eReader .pdb books. Most were created by me from text and PDF files using a small utility called TLPDB I found ages ago.

All these files are compatible with FBReader v0.10 in the sense that once the .pdb file is opened, the text gets displayed and I can read the book. And they all show up in the Library. There are is a bug in v0.10, because although the files show up in Library, I cannot click to open them. However going into Menu -> Open book works perfectly.

Now the biggest problem with both v0.12 and v0.14 is that the Menu -> Open book option has disappeared. Also only 2 out of about 100 .pdb books show up in the library, although all the .pdb files are in the same folder, and I set that folder as the Library path. But that doesn't even matter since I can't click on anything in Library anyway.

So the latest versions do not allow me to open any of my .pdb books. I downgraded to v0.10 and thankfully it works again...