Have exactly the same problem. I have IDN domains on my server. In the log there is following:
[2198]: 2015-09-18 14:36:12 DEBUG Found dump status: 'dump-status="WRONG-FORMAT"'
[2198]: 2015-09-18 14:36:12 DEBUG The check dump return '1'
[2198]: 2015-09-18 14:36:12 ERROR 71bc2c35-adbc-4ec4-8a52-a8ae7a3d4c9c The dump have been invalidated by check-dump operation
[2198]: 2015-09-18 14:36:12 DEBUG Runtime error: The check dump failed with code '1'. The dump can contain invalid data! at /opt/psa/admin/bin/plesk_agent_manager line 1019.
The check dump failed with code '1'. The dump can contain invalid data! at /usr/share/perl5/Error.pm line 38.
Error::_throw_Error_Simple('HASH(0x1064550)') called at /usr/share/perl5/Error.pm line 307
Error::subs::run_clauses('HASH(0x2ce8d00)', 'The check dump failed with code \'1\'. The dump can contain i...', undef, 'ARRAY(0x1fe9be8)') called at /usr/share/perl5/Error.pm line 427
Error::subs::try('CODE(0x105bb40)', 'HASH(0x2ce8d00)') called at /opt/psa/admin/bin/plesk_agent_manager line 1125
main::main() called at /opt/psa/admin/bin/plesk_agent_manager line 1129
[2198]: 2015-09-18 14:36:12 ERROR 2b483a50-c892-4fee-8aaf-c7f00112280d Runtime error: The check dump failed with code '1'. The dump can contain invalid data! at /opt/psa/admin/bin/plesk_agent_manager line 1019.
:
at /opt/psa/PMM/agents/shared/Logging.pm line 100.
Logging::error('Runtime error: The check dump failed with code \'1\'. The dum...', 'fatal') called at /opt/psa/admin/bin/plesk_agent_manager line 1123
main::__ANON__('Error::Simple=HASH(0x35c7618)', 'SCALAR(0x1fe9648)') called at /usr/share/perl5/Error.pm line 340
eval {...} called at /usr/share/perl5/Error.pm line 330
Error::subs::run_clauses('HASH(0x2ce8d00)', 'The check dump failed with code \'1\'. The dump can contain i...', undef, 'ARRAY(0x1fe9be8)') called at /usr/share/perl5/Error.pm line 427
Error::subs::try('CODE(0x105bb40)', 'HASH(0x2ce8d00)') called at /opt/psa/admin/bin/plesk_agent_manager line 1125
main::main() called at /opt/psa/admin/bin/plesk_agent_manager line 1129