Sorry to hear you ran into some problems. Signal versions its web resources so browsers should pick up the new data on an update, but I've noticed that recent versions of Chrome don't check for a new version of the iframe when the parent page is reloaded. I'll see if I can find a way around that.
For the album art, it looks like the web service Signal uses for lookups is returning 500 errors. On Windows Signal advertises itself using a generic IE user agent and the web service apparently no longer likes this. I've posted a new build that changes the user agent and should get things going again for you:
I haven't used forked-daapd myself but my understanding is that it does support local album art to a degree. If iTunes picks up on artwork from it Signal should too. Otherwise if no artwork is found in the media player Signal will automatically try the web search.
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