Manually installing custom theme breaks localhost completely
Fair warning, I am fairly new to using concrete5, so let me know if there is any information I failed to provide.
If your colleagues are using Macs, they will likeley be using MAMP instead of WAMP on your Win7 machine.
Both programms are just creating a virtual Linux Environment where Apache and MySQL Server can be run.
First thing would be to check configurations. Are both MAMP and WAMPs using the same setup? Same PHP Version, same Apache Version, are they rooting to the same ports?
I've read some forum posts that there are sometimes problems with Windows-based environments because of the case-sensitivity which creates problems in SQL.
I have no idea what this might be yet, but these are the tracks I would check out...
Have you looked at the error log?
Where are you putting the 'themes' when you manually install, in the 'Application' folder?