[plt-scheme] DrScheme3m error when using the Help Desk

I am getting the attached error output when using DrScheme3m in OSX  
10.4.7.
The error is triggered each time that I right click in a symbol and  
choose
the "Exact lucky search in Help Desk for ..." menu option.  -- Jaime


"dispatchers/dispatch-servlets.ss" broke the contract
   (-> execution-context? connection?)
on execution-context-connection; expected <execution-context?>,  
given: #f

=== context ===
/Users/jvargas/languages/plt/collects/mzlib/private/contract-guts.ss: 
189:2: raise-contract-error
execution-context-connection
/Users/jvargas/languages/plt/collects/web-server/dispatchers/dispatch- 
servlets.ss:114:19: the-exit-handler
.../managers/manager.ss:18:44
.../managers/manager.ss:18:44
/Users/jvargas/languages/plt/collects/web-server/managers/timeouts.ss: 
39:51
.../web-server/timer.ss:91:25
provide/contract-field-contract-action-timer
provide/contract-field-contract-action-timer
provide/contract-field-contract-action-timer
provide/contract-field-contract-action-timer
provide/contract-field-contract-action-timer
provide/contract-field-contract-action-timer
provide/contract-field-contract-action-timer
provide/contract-field-contract-action-timer
provide/contract-field-contract-action-timer
...