The first thing I'd like to mention is that, in most cases, Windows will choose the Personal certificates store unless you specify a different store in the Certificate Import Wizard. Given that's the case, will you please double check that you selected Place all certificates in the following store, and then Trusted Root Certification Authorities (under Browse) on the computer you're having trouble with?
Also, will you clarify where you got the cert for the second computer from? If you saved the original .crt file from the LEM Manager in your network share, you should be fine. However, if the first thing you did before importing the certificate on the second computer was to export it from Windows on the first computer, that could be causing issues as well.
If you can verify that these things aren't causing your issue, then please post the exact text of the error message you're seeing and we'll see if we can help troubleshoot this further.
Thanks for visiting us on thwack!
Thanks for the help, I spoke with support, and it turned out to be a group policy issue. We ran MMC as administrator, installed the certificate plugin and imported it successfully.