I have a user getting the following error when logged into the Zimbra client. It pops up every few seconds. I cannot replicate this error myself with any browser. Any ideas?

msg: parse error: expected character: {: POST http://server/service/soap/SearchRequest HTTP/1.1 Host: server User-Agent: Mozilla/5.0 (Windows NT 6.0; rv:18.0) Gecko/20100101 Firefox/18.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate DNT: 1 Content-Type: application/soap+xml; charset=utf-8 Referer: http://server/zimbra/ Content-Length: 582 Cookie: WRUID=0; __qca=P0-1818466631-1359015449631; __utma=114421637.1833218096.1359015450.1359015450. 1359015450.1; _
code: service.PARSE_ERROR
detail: soap:Sender
trace: btpool0-545://server/service/soap/SearchRequest:1361800489373:42d68fcc78eed6ea
request: Body: {
SearchRequest: {
_jsns: "urn:zimbraMail",
limit: "500",
offset: 0,
query: {
_content: "inid:15"
},
sortBy: "none",
types: "task"
}
},
Header: {
context: {
_jsns: "urn:zimbra",
account: {
_content: "user@email.com",
by: "name"
},
authToken: "(removed)",
session: {
_content: 18665,
id: 18665
},
userAgent: {
name: "ZimbraWebClient - FF3.0 (Win)",
version: "7.1.4_GA_2555"
}
}
}