Betfair Mobile on Android Jelly Bean problem

I have been running Jelly Bean on a Galaxy Nexus for a while but every time I try to start Betfair Mobile (version 2.1.34), it attempts to start up but closes with the message "Unfortunately, Betfair has stopped working". I have tried clearing cache, re-downloading etc. but I still have the same problem.

I have collected the logcat and can provide if necessary but a few of the lines showing the problem are...

W/System.err(28696): java.lang.IllegalArgumentException: bad parameter
W/System.err(28696): at org.apache.http.client.utils.URLEncodedUtils.parse(URLEncodedUtils.java:139)
W/System.err(28696): at org.apache.http.client.utils.URLEncodedUtils.parse(URLEncodedUtils.java:76)

Has anyone else seen the same problem on Jelly Bean?