Never have experienced this before:
When I use the letter "r" in the Wicker SF font and
after zooming larger than about 185%, that letter is truncated.
I only see this when this letter used as the last one. If followed by
another letter, this does not happen. And it is only with this particular letter "r".
Can somebody shed some light here please?
I have put a sample in the attachment.

Hhmm, I can't seem to reproduce that (Windows 7, 64-bit, Inkscape 0.91, 32-bit).

What is your operating system and Inkscape version?

It sounds like a display issue of some kind, but I'm not terribly knowledgeable about those. Try shifting the text up or down by using the arrow key -- just need to move it by 1 step. Even just 1 pixel movement might fix it.

Actually, I thought this new renderer in version 0.91 was supposed to eliminate this kind of thing. But maybe you don't use 0.91 yet? Or maybe it's not a display issue at all? Maybe is some kind of text issue?

I did some further investigations on this and discovered that this cutting the last part of a letter
only happens with the letter "r" and only with two fonts: Wicker SF and Caspar SF.
I have two computers both running Linux distros in dual boot:
Linux Mint 17.1 64bit dual boot with PCLinuxOS Full Monty 64 bit
PCLinuxOS MATE 64bit dual boot with PCLinuxOS KDE64 bit
The all have Inkscape 0.91 installed. The all display the same "problem".
I cannot test this on a computer with WIndows o.s. because I do not have this. (Only have windows in my walls ).
Both pc's have in the box:
ASUS H81M-PLUS motherboard and on board graphics card.
I only use a LG 27" IPS Led monitor running 1920x1080 resolution and a HDMI connection to the computers.

I´m pretty sure it´s the font. I tested a few Wicker st fonts which are free available (You might try out which seems its commercial origin http://www.myfonts.com/fonts/softmaker/wichita-serial/regular/buy.html