Hello,
Thank you for bringing this to our attention.
It appears that when English is the only language installed the value doesn't get saved after clicking OK. When multiple languages are installed if the first language is selected this language doesn't get saved. The index value of the first item is zero and the evaluation was looking for an index > 0
I have posted a new build on the website to address this issue.
I was just working on the language select dialog last night and I can't believe I overlooked this issue. I guess it goes to show I'm only human