Error: Failed to initialize database.

RH10, WebHelp Pro, Robohelp Server 9

First, please do not move this question to the Server forum because plainly part of the problem is happening before the output is published.

After generating output and choosing FIle > View> Primay Layout, every thing looks OK except that if I click the Search button,  I get the Search input box and below it, the message:

Error: Failed to initialize database.

If I enter any valid search term, the only response is:

null

We publish our output to two identically configured WebPro servers. After publishing the above output, the result is that on one server, the published output works fine, including searches. On the other server, clicking the Search button produces a completely blank navigation pane.

These results are infinitely repeatable despite numerous server restarts, deletions of SSL folders, CPD files, all the usual suspects.

SO the questions I have are:

1. What  database is failing to initialize?
2. What would account for two different published output results on two identically configured servers in the same environment (Windows 7, IE 9) ?
3. What do I need to do to get a response from Adobe technical support to my requests for assistance??