500 Error when user tries to confirm subscription

[tagmike]

I'm using 4.3.2 on a Bluehost Apache server. I haven't made any changes to configuration since I upgraded to 4.3.2 (months ago) via Simplescript. I've probably send half a dozen mailings since then with no problem. Last weekend a reader tried to subscribe and got the Server Error 500 message below when she tried to confirm. Looking at the error logs it appears that two or three other people ran into the same problem trying to subscribe, but never contacted me about it.

Could Bluehost have upgraded or changed something that could cause this? Any idea how I can get it back together?

Error message follows:

Program Error (Server Error 500)

More information about this error may be available in the server error log and/or program error log.

is only avaliable with the XS version at /usr/share/perl5/Math/Complex.pm line 71
BEGIN failed--compilation aborted at /usr/share/perl5/Math/Complex.pm line 71, <CONFIG> line 1.
Compilation failed in require at /usr/share/perl5/Math/Trig.pm line 13, <CONFIG> line 1.
BEGIN failed--compilation aborted at /usr/share/perl5/Math/Trig.pm line 13, <CONFIG> line 1.
Content-type: text/html
Program Error (Server Error 500)

More information about this error may be available in the server error log and/or program error log.

[Mon Jun 18 23:06:07 2012] mail.cgi: is only avaliable with the XS version at /usr/share/perl5/Math/Complex.pm line 71
[Mon Jun 18 23:06:07 2012] mail.cgi: BEGIN failed--compilation aborted at /usr/share/perl5/Math/Complex.pm line 71, <CONFIG> line 1.
[Mon Jun 18 23:06:07 2012] mail.cgi: Compilation failed in require at /usr/share/perl5/Math/Trig.pm line 13, <CONFIG> line 1.
[Mon Jun 18 23:06:07 2012] mail.cgi: BEGIN failed--compilation aborted at /usr/share/perl5/Math/Trig.pm line 13, <CONFIG> line 1.
Compilation failed in require at DADA/perllib/GD/SecurityImage/GD.pm line 83, <CONFIG> line 1.

[justin]

I'm pretty sure this error is tied in with the default Captcha system in Dada Mail. Disable that (or move to reCaptcha) and that error should clear up,