I came across a issue with steam . when I opened steam everything was blank , all tabs, library, store , ect showed nothing , blank . Games I had installed still launched and ran fine .
My fix was to enable the beta of steam and that did the trick .
wish I had of know this before I tried uninstalling everything , including my games . But in posting this My hope is I can help someone else 
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There is a subsection in this forum called “Stable Updates - Manjaro Linux Forum”
With the release of stable updates, many potential issues are collected and discussed there, including the problem with Steam.
It’s all there, you just need to see it 
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it is a steam problem , not manjaros’ fault . I googled this issue and that is how I came up with the fix .
As a side note the Steam UI beta is better then the official version . Fonts are crisp, layout vastly improved . a definite upgrade