EMSS Header Question

You can change via CSS in WEBDIR/lawson/xhrnet/ui/ui.css

Change the background properties for the .logo and .logosmall classes

...We recently moved to the 9.0 Apps and updated our EMSS as well to 9.0.1. Now whenever we click on anything in EMSS ...

Are your version numbers correct?  We just tried that and it looks like ESS/MSS is not happy with that combination.  We have ended up installing 9.0.0.5 ESS/MSS for now.  For instance it looked like it wanted a directory called ...\lawson\webappjs\lds\... and we don't even have that directory.  Maybe are portal needs more patches?

You need to install the "Common browser library" before you install MSS/ESS.

I made changes to the WEBDIR/lawson/xhrnet/ui/ui.css file for logo_lg and logo_sm and cleared cache, but the logo is still there. The header turned gray. I may hove something else going on.

We are on Apps/environment/portal 9.0.0.5, CBL/EMSS 9.0.1 (Lawson's direction).

We are running ESS/MSS right now in prod, it is just the upgrade that didn't like the combination of 9.0.1 ESS/MSS with apps 9.0.0.5. Is the common browser library a new install as of 9.0.0.x? Is that a Lawson download?

CBL is a Lawson download, and has been around for many years, since at least 8.0.x.
It needs to be installed prior to using ESS/MSS. (It used to be also used with RSS, but no longer).