When I use the advanced search function and select "manhua," all I get is "There are no series in the database." I thought at first it was because of the genre limitations I had selected. Then I did a new search with no criteria except "manhua" and I still get no series. So, no manhua are coming up in any searches.

I did exactly what you said but I see results
https://www.mangaupdates.com/series.html?type=manhua&perpage=50

A just ruler amongst tyrants

If it can help as feedback, I don't see any results either using lambchopsil's link

My current top 3:
Fullmetal Alchemist
Pandora Hearts
3-gatsu no Lion

Try deleting your cache and cookies? I've tested my link without logging in on Chrome, Firefox, and IE, and it worked on all of them

A just ruler amongst tyrants

Yeah, definitely on the user's end, I'm getting the same 750 or so titles either with lambchopsil's link or by doing the search myself, no problems.

I've cleared my cache and cookies. I tried the search before logging back in to my account - it works just fine. Then I logged back in - search shows no results. Very strange.

Quote from chibilin

I've cleared my cache and cookies. I tried the search before logging back in to my account - it works just fine. Then I logged back in - search shows no results. Very strange.

Same here. Tried with both Chrome and IE.

My current top 3:
Fullmetal Alchemist
Pandora Hearts
3-gatsu no Lion