error message for zimbra email only

[ctippy]

I am using Yahoo Zimbra Desktop 1.0.3 (build 1691) on a new windows machine- I have four different e-mail's going to the desktop and am having several problems with error messages. The most consistant is when I click on my zimbra e-mail from a different mailbox it shows an error message "A network service error has occurred (zclient/io)."

Can someone please tell me why this is happening and how to make it stop?

The detailed error report reads:

Method:GetMiniCalRequest
Msg: unable to parse response

500 Internal server Error

nginx/0.5.30

code: zclient.IO_ERROR
detail: soap:Sender
trace: btpool0-24:1258609804734:9e6f2fbcea2ed4f1
request:

Body: {
GetMiniCalRequest: {
_jsns: "urn:zimbraMail",
e: 1260684000000,
folder: [
0: {
id: "c002c726-ebc2-4bb7-8f01-e6bc03062263:10"
},
1: {
id: "c002c726-ebc2-4bb7-8f01-e6bc03062263:947"
},
2: {
id: "c002c726-ebc2-4bb7-8f01-e6bc03062263:2836"
},
3: {
id: "c002c726-ebc2-4bb7-8f01-e6bc03062263:3420"
},
4: {
id: "c002c726-ebc2-4bb7-8f01-e6bc03062263:1965"
}
],
s: 1257051600000
}
},
Header: {
context: {
_jsns: "urn:zimbra",
account: {
_content: "ctippy@nowcrj.org",
by: "name"
},
authToken: "(removed)",
format: {
type: "js"
},
notify: {
seq: 26
},
sessionId: {
_content: 197,
id: 197
},
userAgent: {
name: "ZimbraWebClient - PRISM (Win)",
version: "0.0"
}

[landrypm]

I just started receiving this error message today. Did you ever determine the cause?