Both of the providers uses MarketManager, after installing both of them I
can see MarketManager and in DataManager, tabs fpr ASCII and DDE Data.

After uninstalling IQFeed provider I'm not able to see MarketManager or the tabs
mentioned above any more. It seems that MarketManager.dll is deleted but QuoteMedia
needs it. Maybe the providers share the same dll?

This is the behavoiur on my 64Bit machine. After uninstalling and installing
QuoteMedia-Provider again, everything works fine and I can see MarketManager again.

Is this a known bug?

Gambe

Any provider that uses the Market Manager will stop working if you uninstall any other provider that depends on the MM. It's a shared component.

This is not a bug, this is by design. Just keep this in mind before uninstalling providers (why would one do that anyway).

Ok, did not know that about shared components, thanks.

It was my fault. From now on, newly uploaded/updated extensions (including QuoteMedia) will keep shared libraries like Market Manager, HTMLAgilityPack, ZedGraph etc.