X-Files was produced and filmed in Canada. Season 6 they moved to film in Hollywood. It wasn't enough to move the film location though. Hollywood got its hooks in and nearly tanked one of the most popular shows on TV. Season 6 saw the first big ratings drops. The showrunner moved to appease David Duchovny, not to replace the crew. After Season 5 there was a big struggle to get the show back on track, and away from Hollywood. It never really did. There were moments of greatness but no consistency. And all of this took place in the time frame that would have aired a Spelljammer tv show.
Firework (and similar groups, often distributed by Tribune Entertainment) did a lot of tv shows that seemed to be trying to capitalize on the potential boom in hit syndicated shows that Baywatch/Highlander/Hercules/Xena could have engendered. They were often (in the U.S.) shown late at night on Friday/Saturday/Sunday and were marketed to the young adult male demographic. I think they also did a lot of work capitalizing on tax credits or similar that Canada and New Zealand gave for filming there. I remember videotaping a block of TV that included Gene Roddenberry's Andromeda, Beastmaster: the Series, Mutant X, Total Recall 2070, and Sir Arthur Conan Doyle's the Lost World (followed by Stargate SG-1 reruns) specifically to watch while sobering up after a night out (or in, I had a problem).
Honestly speaking, most of the shows were... just fine. Other than sometimes lower production values, there was nothing in particular that made these shows mostly forgotten footnotes while other turn of the century episodic action/fantasy/sci-fi shows like Stargate, Xena, Buffy, Charmed ended up as cultural touchstones. I think they just tried to capitalize on a boom that didn't materialize*. *Plus for Firework specifically I think there was a big legal battle over Mutant X, because Marvel sold them the rights and they thought they could use a bunch of stuff, but turns out it was only that stuff that Marvel hadn't sold to Sony, which wasn't much, and it was a whole big hullabaloo and I have no idea who if anyone is the good or bad guys in the story, but I suspect it was a distraction that a small tv producer really couldn't survive.