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[kde] icons of dolphin all wrong

Hi all,

I have had some serious problems with plasma 5.4 since my upgrade from 15.04 to 15.10 of ubuntu.

In order to help I though an upgrade top 5.5 using the ppa packages was a good idea ... it was not. I could not even logon (sddm showed black screen)

After a ppa-purge which went well I could again login but now my
dolphin icons are wrong.  Before I had blue icons for folders and now I have this black and white minimal icon (which I can't find anywhere in my filesystem ?)

Also I have lost a few icons in my panel from some application I put there for shortcuts (one of them being firefox).

So Question

1. how can I recover my dolphin icon (I already did plenty of icon cache removals)
2. where can I find why the panel no longer finds my icons

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