WebResource.axd problem in EPiServer CMS 5
With our first EPiServer CMS 5 based solution we had strange problem related with WebResource.axd. We were getting the exception:
The WebResource.axd handler must be registered in the configuration to process this request
After searching for this exception in Google I have found a post about this on Fredrik Haglund's blog. We have had applied his patch and it seems to solve the problem (at least until it will be solved by EPiServer or whoever responsible for that).
Anyway I thought that we did something special in that one project and that this problem is that project specific only. Unfortunately it occurred that the exception is thrown from time to time in all our EPiServer CMS 5 projects. The worst thing is that we are not able to reproduce error or identify what makes this error more probable to occur. It is thrown from time to time without any clear reason.
For now we have started to adding patch to all ours CMS 5 projects. But this is something that has to be solved somehow. We are monitoring EPiServer's forum and waiting for this problem to be solved. When you will read comments to the Fredrik's post you can see that they are working on that - and I will keep my finger crossed for them to fix it 
UPDATE:
Today I have found this post. It seems that the reason of error has been found and that there is a workaround.