Hi Gidgidonihah,
You can find some discussion regarding this one in the beta thread - in general it seems to be a Yosemite issue. However based on some other feedback we received we did have a play around with fallback text encodings in the latest beta version which may help (or may not). If you’d like to give this a try the direct link (at the time of writing) to the latest beta is:
http://swupdate.sparklabs.com/download/mac/beta/viscosity/Viscosity%201.5.1b2.dmg
Cheers,
James
