I seem to have successfully installed STACK. All the tests in the healthcheck pass except for the first one and the one for TtM:
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Testing Configuration
Your browser does not support MathML. Using LaTeX to HTML conversion.
MathML is supported by Firefox, Seamonkey and Internet Explorer with MathPlayer. 
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But I am using Firefox.
The following also fails, but I understand it is optional:
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Failed No output from TtM
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When I Test AlgEquiv all tests pass except for the following:
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| fail | 2/%i*ln(sqrt((1+z)/2)+%i*sqrt((1-z)/2)) | -%i*ln(z+i*sqrt(1-z^2)) |
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Anyhow my problem is the following:
When I add a STACK question to a quiz and take the quiz, when an answer is put into the student answer box and the submit button is clicked, I get a blank white page at the following address:
"http://cfll.dvrdns.org/mod/quiz/attempt.php?q=10&page=0"
I am not sure if it is the same address but the blank white screen happens with all my STACK questions. Other questions seem to work OK.
I am using:
STACK 2.0 beta (Maxima 5.20.1, unix)
I turned on debugging and got the following Fatal error instead of a blank screen:
Fatal error: Call to a member function compare_responses() on a non-object in /var/www/moodle_19_latest/lib/questionlib.php on line 1322
Any help would be much appreciated.
Bill Dika