vb2012.net and crystal reports

Question

Hello All First time poster so please be gentle with me. I have developed in vb2010.net with crystal successfully in the past and had no problems that I remember. I have decided to upgrade to vb2012.net and I am having a few issues. I downloaded the crystal developer version for vb2012, installed it, including the run time files, and I have been developing fine. I have released a beta copy of my application to a client, and after installing the latest crystal runtime files on their machine it just will not run a report. Application crashes when a report is selected. All fine on my development machine. Anyone got any ideas ? Steve