Please make sure that your license key is not being used by another developer at your company (or you don't use your personal license on two machines) at the same time. Concurrent use of a single license on multiple instances of the software is restricted by our software license agreements.
In other words, you may use your license on several PCs separately, but you are not allowed to run multiple instances of ReSharper with the same license on different PCs simultaneously.
If a single License Key is used on two machines at the same time, the following information dialog will appear:
This dialog contains hostname and IP adress of the 2nd machine (which is using the same License Key), so the License usage can be tracked easily.
You may either:
1. Enter another License Information.
2. Disable remote instance of ReSharper.
3. Disable local instance of ReSharper.
Currently, Virtual Machines (VMs) are also counted as a standalone PCs, so it is not possible to use ReSharper on the host machine and virtual machine at the same time with a single License Key (or use Resharper license on multiple virtual machines at once).
Note: Since ReSharper 10 we have turned off this detection for Personal License Keys.
Commercial License Keys are still detected if run simultaneously.