Problem with DrawPane

SmartClient Version: v9.1p_2014-10-05/PowerEdition Deployment (built 2014-10-05)

Chrome Version 37.0.2062.124 m, Firefox 26.0

DrawPane works perfectly in GWT hosted mode. But when the application is deployed to Tomcat 7.0, the lines we are drawing in it fail to be drawn.

Javascript errors from Dev console below. Any suggestions?

20:25:41.251:TMR7:WARN:Log:[Exception... "Failure" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: http://localhost:8080/AtlanticScheduler/AtlanticScheduler/sc/modules/ISC_Drawing.js :: isc_DrawPane_getBitmapContext :: line 98" data: no] [No error.stack available]
20:25:41.251:TMR7:WARN:Log:Uncaught JavaScript exception: NS_ERROR_FAILURE: in http://localhost:8080/AtlanticScheduler/AtlanticScheduler/sc/modules/ISC_Drawing.js, line 98
20:25:41.251:TMR8:WARN:Log:[Exception... "Failure" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: http://localhost:8080/AtlanticScheduler/AtlanticScheduler/sc/modules/ISC_Drawing.js :: isc_DrawPane_getBitmapContext :: line 98" data: no] [No error.stack available]
20:25:41.251:TMR8:WARN:Log:Uncaught JavaScript exception: NS_ERROR_FAILURE: in http://localhost:8080/AtlanticScheduler/AtlanticScheduler/sc/modules/ISC_Drawing.js, line 98
20:25:41.268:TMR9:WARN:Log:[Exception... "Failure" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: http://localhost:8080/AtlanticScheduler/AtlanticScheduler/sc/modules/ISC_Drawing.js :: isc_DrawPane_getBitmapContext :: line 98" data: no] [No error.stack available]