I just upgraded to Firefox 12. Now I'm getting the following error gets thrown whenever I click on the Import button in DAM (5.5 HF05). Also happens with the Clear filters button. I tried this with three other browsers (Safari 5.1.5, IE 9.0.8112.16421, and Chrome 16.0.912.75) and none of these threw the error. It appears to be AJAX related, but I'm hoping somebody has seen something similar :-) and can point to possible cause.

2012-05-10 09:15:18,673 ERROR [nuxeo-error-log] 
Request Attributes:

securityError : false
nuxeo.disable.redirect.wrapper : true
exception_message : incorrect data check
stackTrace : javax.servlet.ServletException: javax.faces.FacesException: Error decode resource data
    at org.nuxeo.ecm.platform.ui.web.rest.FancyURLFilter.doFilter(FancyURLFilter.java:137)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.nuxeo.ecm.platform.wi.filter.WIRequestFilter.doFilter(WIRequestFilter.java:114)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.nuxeo.ecm.platform.web.common.requestcontroller.filter.NuxeoRequestControllerFilter.doFilter(NuxeoRequestControllerFilter.java:141)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.nuxeo.platform.login.web.LoginStackCleaner.doFilter(LoginStackCleaner.java:49)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.nuxeo.ecm.platform.web.common.exceptionhandling.NuxeoExceptionFilter.doFilter(NuxeoExceptionFilter.java:79)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.nuxeo.ecm.platform.web.common.encoding.NuxeoEncodingFilter.doFilter(NuxeoEncodingFilter.java:59)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
    at java.lang.Thread.run(Thread.java:619)
Caused by: javax.faces.FacesException: Error decode resource data
    at org.ajax4jsf.resource.ResourceBuilderImpl.decrypt(ResourceBuilderImpl.java:627)
    at org.ajax4jsf.resource.ResourceBuilderImpl.getResourceDataForKey(ResourceBuilderImpl.java:369)
    at org.ajax4jsf.resource.InternetResourceService.serviceResource(InternetResourceService.java:156)
    at org.ajax4jsf.resource.InternetResourceService.serviceResource(InternetResourceService.java:141)
    at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:488)
    at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56)
    at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
    at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.nuxeo.ecm.platform.ui.web.rest.FancyURLFilter.doFilter(FancyURLFilter.java:131)
    ... 27 more
Caused by: java.util.zip.DataFormatException: incorrect data check
    at java.util.zip.Inflater.inflateBytes(Native Method)
    at java.util.zip.Inflater.inflate(Inflater.java:223)
    at java.util.zip.Inflater.inflate(Inflater.java:240)
    at org.ajax4jsf.resource.ResourceBuilderImpl.decrypt(ResourceBuilderImpl.java:621)
    ... 37 more

user_message : an unexpected error occurred
NuxeoExceptionHandlerMarker : true

Cheers, Bruce