Having trouble running multiple instances of Firefox in XenDesktop 7.1

We recently upgraded our Citrix environment to XenDesktop 7.1. We published Firefox, but only one user at a time can have the program open. When we try to run multiple sessions, we get this error message "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system."
We've had it published in previous Citrix environments with no problems. How do we need to configure Firefox in XenDesktop so that multiple users can run the program at the same time? Thanks.

I do not understand virtualisation.
I can however say that ordinarily Firefox needs each user to have a separate profile and for Firefox to open simultaneous multiple instances with separate profiles the ''-no-remote'' argument needs to be used.
* http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox
* http://kb.mozillazine.org/Opening_a_new_instance_of_your_Mozilla_application_with_another_profile

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''(If you're not using it, switch to the Default theme.)''
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If there is someone who would like to look at this problem I'd like to show you program log files with verbose output turned on. There are 11 log files in the archive: http://bin.mypage.sk/FILES/log.rar
Log files that end up with lines like this one below mean that program finished running ok:
4000|0 4 20100922 07:07:24.094 20100922 07:07:24.094 FLOW_CMD
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FilePersistentStorage::open() start
FilePersistentStorage::open() ReadDir
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FilePersistentStorage::open() db_env_create ok
FilePersistentStorage::open() set cachesize
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envp->open
FilePersistentStorage::open() envp->open
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fileops: close db_files/__db.001
fileops: open db_files/__db.001
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fileops: close db_files/__db.001
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fileops: unlink db_files/__db.004
fileops: unlink db_files/__db.003
fileops: unlink db_files/__db.002
fileops: unlink db_files/__db.001
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fileops: open db_files/__db.001
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fileops: close db_files/log.0000000001
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fileops: write db_files/__db.005: 8192 bytes
fileops: mmap db_files/__db.005
fileops: close db_files/__db.005
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fileops: write db_files/__db.006: 8192 bytes
fileops: mmap db_files/__db.006
fileops: close db_files/__db.006
fileops: open db_files/log.0000000001
fileops: read db_files/log.0000000001: 12 bytes at offset 335
fileops: read db_files/log.0000000001: 371 bytes at offset 0
fileops: directory list db_files
fileops: open db_files/log.0000000001
fileops: read db_files/log.0000000001: 28 bytes
fileops: close db_files/log.0000000001
Recovery starting from [1][243]
fileops: close db_files/log.0000000001
fileops: open db_files/log.0000000001
fileops: read db_files/log.0000000001: 28 bytes
fileops: write db_files/log.0000000001: 92 bytes at offset 371
fileops: flush db_files/log.0000000001
fileops: close db_files/log.0000000001
fileops: open db_files/log.0000000002
fileops: close db_files/log.0000000002
fileops: open db_files/log.00002
fileops: close db_files/log.00002
fileops: open db_files/log.0000000001
fileops: seek db_files/log.0000000001 to 463
fileops: write db_files/log.0000000001: 4096 bytes
fileops: write db_files/log.0000000001: 4096 bytes
fileops: write db_files/log.0000000001: 4096 bytes
fileops: write db_files/log.0000000001: 4096 bytes
fileops: write db_files/log.0000000001: 3633 bytes
fileops: close db_files/log.0000000001
Recovery complete at Wed Sep 22 07:07:23 2010
Maximum transaction ID 80000002 Recovery checkpoint [1][371]
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fileops: read db_files/log.0000000001: 28 bytes
fileops: write db_files/log.0000000001: 67 bytes at offset 463
fileops: flush db_files/log.0000000001
fileops: open db_files/__db.80000001.d9f23b56
fileops: stat db_files/__db.80000001.d9f23b56
fileops: seek db_files/__db.80000001.d9f23b56 to 0
fileops: write db_files/__db.80000001.d9f23b56: 4096 bytes
fileops: seek db_files/__db.80000001.d9f23b56 to 4096
fileops: write db_files/__db.80000001.d9f23b56: 4096 bytes
fileops: flush db_files/__db.80000001.d9f23b56
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fileops: stat db_files/test_aaps.db
fileops: stat db_files/__db.80000001.d9f23b56
fileops: unlink db_files/__db.80000001.d9f23b56
fileops: open db_files/log.0000000001
fileops: read db_files/log.0000000001: 12 bytes at offset 463
DB_LOGC->get: LSN 1/463: invalid log record header
DB_TXN->abort: log undo failed for LSN: 1 463: Input/output error
fileops: close db_files/log.0000000001
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fileops: read db_files/log.0000000001: 12 bytes at offset 463
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PANIC: DB_RUNRECOVERY: Fatal error, run database recovery
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Open file handle: db_files/log.0000000001
fileops: close db_files/log.0000000001
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