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%3CLINGO-SUB%20id%3D%22lingo-sub-734803%22%20slang%3D%22en-US%22%3EProject%20Online%20or%20Project%20Server%20-%20best%20leave%20the%20master%20pages%20alone!%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-734803%22%20slang%3D%22en-US%22%3E%3CP%3EBecause%20some%20customizations%20can%20break%20Project%20Web%20App%20pages%20we%20have%20always%20blocked%20SharePoint%20Designer%20from%20editing%2Fchanging%20a%20PWA%20master%20page%20-%20and%20in%20the%202007%20version%20I%20even%20blogged%20about%20it.%26nbsp%3B%20Time%20moves%20on%20and%20there%20are%20now%20new%20ways%20to%20play%20about%20with%20master%20pages%2C%20and%20new%20ways%20to%20break%20PWA!%26nbsp%3B%20Design%20Manager%20was%20released%20a%20couple%20of%20years%20ago%20to%20allow%20easy%20branding%20of%20SharePoint%20pages%2C%20and%20this%20isn't%20something%20we%20can%20block%20for%20PWA%20so%20it%20is%20possible%20to%20break%20our%20pages%20-%20so%20for%20the%20best%20experience%20do%20not%20update%20the%20master%20pages%20on%20a%20PWA%20site.%3C%2FP%3E%0A%3CP%3EAs%20with%20any%20'unsupported'%20change%20that%20doesn't%20always%20mean%20you%20shouldn't%20do%20it%20-%20but%20just%20be%20prepared%20that%20it%20might%20break%20something%2C%20so%20test%20thoroughly%20and%20then%20if%20you%20do%20find%20a%20break%20you%20will%20need%20to%20either%20fix%20it%20by%20reverting%20or%20further%20modification.%26nbsp%3B%20We%20can't%20help%20you%20from%20support%20to%20troubleshoot%20the%20break%20-%20our%20support%20only%20extends%20to%20reverting%20to%20the%20original%20master%20page.%26nbsp%3B%3C%2FP%3E%0A%3CP%3EThe%20most%20recent%20issue%20I've%20heard%20of%20where%20a%20master%20page%20caused%20problems%20affected%20some%20of%20the%20charts%20in%20the%20Resource%20Center%20-%20but%20I'm%20sure%20there%20are%20many%20different%20ways%20that%20things%20might%20break.%3C%2FP%3E%0A%3CP%3EWe%20have%20added%20this%20unsupported%20scenario%20to%20our%20software%20boundaries%20and%20limits%20documentation%20at%26nbsp%3B%3CA%20href%3D%22https%3A%2F%2Fdocs.microsoft.com%2Fen-us%2Fprojectonline%2Fproject-online-software-boundaries-and-limits%22%20target%3D%22_blank%22%20rel%3D%22noopener%20noreferrer%20noopener%20noreferrer%22%3Ehttps%3A%2F%2Fdocs.microsoft.com%2Fen-us%2Fprojectonline%2Fproject-online-software-boundaries-and-limits%3C%2FA%3E%3C%2FP%3E%0A%3CP%3EJust%20for%20reference%20-%20the%20documentation%20for%20Design%20Manager%20can%20be%20found%20here%20-%26nbsp%3B%3CA%20href%3D%22https%3A%2F%2Fdocs.microsoft.com%2Fen-us%2Fsharepoint%2Fdev%2Fgeneral-development%2Foverview-of-design-manager-in-sharepoint%22%20target%3D%22_blank%22%20rel%3D%22noopener%20noopener%20noreferrer%20noopener%20noreferrer%22%3Ehttps%3A%2F%2Fdocs.microsoft.com%2Fen-us%2Fsharepoint%2Fdev%2Fgeneral-development%2Foverview-of-design-manager-in-sharepoint%3C%2FA%3E%26nbsp%3B%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-TEASER%20id%3D%22lingo-teaser-734803%22%20slang%3D%22en-US%22%3E%3CP%3EWe%20have%20always%20blocked%20SharePoint%20Designer%20from%20allowing%20master%20page%20edits%20as%20it%20can%20break%20PWA%20-%20and%20we%20had%20a%20post%20that%20I%20chose%20not%20to%20migrate%20as%20it%20was%20based%20on%202007%20-%20but%20as%20there%20are%20new%20ways%20to%20change%20master%20pages%20it%20is%20time%20for%20a%20fresh%20post!%3C%2FP%3E%3C%2FLINGO-TEASER%3E
Microsoft

Because some customizations can break Project Web App pages we have always blocked SharePoint Designer from editing/changing a PWA master page - and in the 2007 version I even blogged about it.  Time moves on and there are now new ways to play about with master pages, and new ways to break PWA!  Design Manager was released a couple of years ago to allow easy branding of SharePoint pages, and this isn't something we can block for PWA so it is possible to break our pages - so for the best experience do not update the master pages on a PWA site.

As with any 'unsupported' change that doesn't always mean you shouldn't do it - but just be prepared that it might break something, so test thoroughly and then if you do find a break you will need to either fix it by reverting or further modification.  We can't help you from support to troubleshoot the break - our support only extends to reverting to the original master page. 

The most recent issue I've heard of where a master page caused problems affected some of the charts in the Resource Center - but I'm sure there are many different ways that things might break.

We have added this unsupported scenario to our software boundaries and limits documentation at https://docs.microsoft.com/en-us/projectonline/project-online-software-boundaries-and-limits

Just for reference - the documentation for Design Manager can be found here - https://docs.microsoft.com/en-us/sharepoint/dev/general-development/overview-of-design-manager-in-sh...