hello, pls contact us either directly with email or with our live chat button. i will check the actual error and see on what is going on.
if you are running vm2.9.9f which has a few functions deleted from currencyDisplay class, i am going to release opc2.0.260 that will work with this version. those functions however will get back within the next vm2.9.x update.
I STRONGLY SUGGEST TO RUN VM3 ON JOOMLA3 and not on J2.5 as the j3 is the main platform for that.
our demos to check these issues are available at http://php56.rupostel.com/
best regards, stan