Default, each new application of BOINC needs authorization by many security packages / Antivirus, usually when a pop-up screen appears to ask if it's OK to launch. You say that 99% fails, so the security software is even suspect to not block consistently. What have you got in the way... McAfee, Comodo, Norton, AVG, Avast? A general save thing to do is set an exception in the scanners to not check on the C:\ProgramData\BOINC directory and it's subfolders. You could also try uninstalling and installing BOINC again (or run the installer with Repair) and see if the issue goes away.

Let us know.

Avast gets my thumbs up [using it 7-8 years now]. Latest [2014] is top... it even scans my outgoing mail and inserts a message at end for recipient when clean [user definable message]... blocks would there ever be a virus/malware/phish thingy found. You can now even recall the last message from the systray area... in case you missed it.

To exempt a zone find the "Exclusions" area. Mine has F:\BOINC\* as entry [exclusive BOINC partition in fact] (Never put BOINC in root... might bite in an unknown future)

Opines will differ on that... if marketing, fine with me. Not going to extend this discussion in this thread. The previous post was an FYI in search of a possible cause of the problem... 99% of the MCM jobs going foul.

I have 3 Beta WUs running all in the same series - BETA_MCM1_0000218_xxxx_x.
They are all taking over 30 hours to run on three different types of CPUS - Xeon, core i7-920, and core i7-930. One has already timed out (core i7-920). Is there something wrong with the series or are they all taking this long? Really would not like to lose beta WUs (working on my Gold badge :) )

I have a couple of machines running the mapping cancer markers project. All are OK except for one which has recently been getting error messages I have never seen before. I have cut and paste these below. This machine now gets the following error messages:

"World Community Grid [error] Can't parse task in scheduler reply: unexpected XML tag or syntax
15/12/2013 10:57:18 PM World Community Grid [error] No close tag in scheduler reply"

messages and cannot upload completed jobs or download new ones.

Any ideas how to fix this problem ?

Full message list is as follows:

15/12/2013 10:25:02 PM World Community Grid Finished upload of MCM1_0000409_9882_1_0
15/12/2013 10:40:28 PM World Community Grid Computation for task MCM1_0000410_4407_1 finished
15/12/2013 10:40:28 PM World Community Grid Starting MCM1_0000426_4205_0
15/12/2013 10:40:28 PM World Community Grid Starting task MCM1_0000426_4205_0 using mcm1 version 726
15/12/2013 10:40:30 PM World Community Grid Started upload of MCM1_0000410_4407_1_0
15/12/2013 10:40:36 PM World Community Grid Finished upload of MCM1_0000410_4407_1_0
15/12/2013 10:57:15 PM World Community Grid Sending scheduler request: To report completed tasks.
15/12/2013 10:57:15 PM World Community Grid Reporting 243 completed tasks, requesting new tasks
15/12/2013 10:57:18 PM World Community Grid [error] Can't parse task in scheduler reply: unexpected XML tag or syntax
15/12/2013 10:57:18 PM World Community Grid [error] No close tag in scheduler reply
15/12/2013 10:58:19 PM World Community Grid Fetching scheduler list
15/12/2013 10:58:20 PM World Community Grid Master file download succeeded
15/12/2013 10:58:25 PM World Community Grid Sending scheduler request: To report completed tasks.
15/12/2013 10:58:25 PM World Community Grid Reporting 243 completed tasks, requesting new tasks
15/12/2013 10:58:28 PM World Community Grid [error] Can't parse task in scheduler reply: unexpected XML tag or syntax
15/12/2013 10:58:28 PM World Community Grid [error] No close tag in scheduler reply
15/12/2013 10:59:29 PM World Community Grid Sending scheduler request: To report completed tasks.
15/12/2013 10:59:29 PM World Community Grid Reporting 243 completed tasks, requesting new tasks
15/12/2013 10:59:32 PM World Community Grid [error] Can't parse task in scheduler reply: unexpected XML tag or syntax
15/12/2013 10:59:32 PM World Community Grid [error] No close tag in scheduler reply
15/12/2013 11:00:33 PM World Community Grid Sending scheduler request: To report completed tasks.
15/12/2013 11:00:33 PM World Community Grid Reporting 243 completed tasks, requesting new tasks
15/12/2013 11:00:36 PM World Community Grid [error] Can't parse task in scheduler reply: unexpected XML tag or syntax
15/12/2013 11:00:36 PM World Community Grid [error] No close tag in scheduler reply
15/12/2013 11:01:37 PM World Community Grid Sending scheduler request: To report completed tasks.
15/12/2013 11:01:37 PM World Community Grid Reporting 243 completed tasks, requesting new tasks
15/12/2013 11:01:39 PM World Community Grid [error] Can't parse task in scheduler reply: unexpected XML tag or syntax
15/12/2013 11:01:39 PM World Community Grid [error] No close tag in scheduler reply
15/12/2013 11:02:40 PM World Community Grid Sending scheduler request: To report completed tasks.
15/12/2013 11:02:40 PM World Community Grid Reporting 243 completed tasks, requesting new tasks
15/12/2013 11:02:43 PM World Community Grid [error] Can't parse task in scheduler reply: unexpected XML tag or syntax
15/12/2013 11:02:43 PM World Community Grid [error] No close tag in scheduler reply
15/12/2013 11:05:03 PM World Community Grid update requested by user
15/12/2013 11:05:05 PM World Community Grid Sending scheduler request: Requested by user.