Unable to Open Project Site Access Denied Issue (Project Manager)

Question

Hi 
We got an issue that one project manager is having 12 projects, in that she can able to view 5 projects-- project sites but remaining 7 projects --- she is not able to open the project site (access denied) error is throwing when she try to open.
She is the project manager of the 12 projects and having project manager permissions on the project sites.
Please suggest any solution for this.
Geeth If you feel that the answer which i gave you is Helpful please select it as Answer/helpful.

Answer 1

I believe I've found the fix for this issue.  After opening a ticket with MS support and not getting anywhere with this issue I decided to do an in-depth review of all the Project and SharePoint 2013 CU's starting with December 2013 to September 2014. 
To my amazement buried inside the July 2014 CU was a hotfix for this issue described almost word for word. (I will list all the relevant KB's at the end)  I contacted my support engineer inquiring about this hotfix and he stated it wasn't relevant because
the "Synchronize Project Web App permissions to Project Site" was not failing or even generating any warnings in our Prod or Test environments.  I stated that is not always an indicator as ULS doesn't always catch all relevant errors.
I informed him that I also found a second hotfix pertaining to the same issue released August 2014, apparently the first hotfix in July didn't totally resolve the issue and a second hotfix was released.  He was adamant that this would not resolve
our issue and he requested or production databases because he was unable to replicate the issue in his test environment.  The reason, you may wonder, is because he was at a higher patch level that our farm.... Obviously!  His farm had the most current
CU which included the hotfixes from July and August.  Apparently he didn't see the flaw in his logic.
I decided to install the September CU on our test farm. Low and behold that fixed the problem, even though MS support stated the hotfix was not relevant to our issue.  I learned a long time ago to take MS support comments as suggestions instead
of gospel truth, this isn't the first time they have confidently given me erroneous information.
We are currently doing further testing to verify that this CU didn't break something else.  Unfortunately these rollups are not GA and Microsoft is very clear that you should only install them if the hotfixes pertain directly to your issue.
Finding the hotfixes was a chore as Microsoft loves to create multiple KB's for the same thing and then nest (bury) them so you have to dig through four or five KB's to find the relevant fix.  I'll save you the trouble and list them below.
Watch the
September CU Webcast Brian Smith and team go into depth explaining why this issue has been happening and how they fixed it.
September 2014 CU http://support.microsoft.com/kb/2882990 (the one I installed)
August 2014 CU https://support.microsoft.com/kb/2989078
August Project site sync hotfix
https://support2.microsoft.com/kb/2883083
July 2014 CU http://support.microsoft.com/kb/2882990
July Project Site Sync hotfix http://support2.microsoft.com/kb/2882995
Microsoft Project Server Blog
http://blogs.technet.com/b/projectsupport/  (I find this to be more helpful than the TechNet site)
Frank Miranda Florida Hospital MIS