Starting with 2010 SP3.0, SolidWorks is checking whether you are on subscription before you install the service pack.  With SP3.0 you will just get a warning if you are not on subscription but starting with SP4.0 you will not be able to install. 

For network licenses, the expiration date is saved on the license server and that is the date that is checked during installation.  Depending on the date the SNL Manager was activated and the subscription expiration date, you may get the message that your subscription has expired even though it has been renewed.

The SolidWorks Flow Simulation can give you a message stating that authorization has failed. This is because on the client machine  the License Manager was opened and the License Order tab was selected. This changes a registry setting that needs to be corrected. Below is the work around for this and it has been corrected in 2010 SP3 which should be released in the middle of April.

Here is the workaround – please be sure you are comfortable editing the registry prior to attempting this procedure. Consider making a backup of the registry beforehand, in case you make a mistake.

If you are experiencing slowness or sluggishness while working on SolidWorks models and you open your files over a network, it is worthwhile to check to see if the network is causing at least some of the problems. 

To test whether performance issues are related to opening files over a network, place an assembly and its referenced files on your local hard drive and work on the assembly from there.

Procedure:

1. If you have the assembly open, go to File>Pack and Go …
2. Alternatively, in Windows Explorer, browse to the assembly, right click, click on SolidWorks, then Pack and Go …
3. In the Pack and Go window, in Save to folder – browse to a folder on your C:\ drive and place in a temporary folder.  In this example I created a new folder just to test this assembly.
4. Add a prefix or a suffix to change the filenames of all of the models so these won’t be confused with your regular models.
5. Click Save

 Open this assembly and work with it for a while and see if you notice an improvement in performance.