This is due a glitch in the code i've found and fixed for next release. I apologize for that
How to recover your old (default) filters:
1) open Log4Om configuration folder.
2) find and DELETE the file named: regexpfilters_Cluster_user.xml
3) start Log4OM
4) open Cluster -> Custom tab -> CHECK if your filters are in place
5) go to FILTERS tab in the cluster module and press the SAVE icon (floppy disk icon)
For your reference, those are the filters available by default:
IOTA:
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(AF|EU|AS|OC|NA|SA|AN|af|eu|as|oc|na|sa|an])((-|\s)?)([0-9]{1,3})
((IOTA)|(iota))
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((?:[a-zA-Z]{1,3}))(FF|ff)((-|\s)?)([0-9]{1,3})
((WFF)|(wff))
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((test)|(TEST)|(contest)|(CONTEST))
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(DCI)((-|\s)?)([a-zA-Z]{1,2})((-|\s)?)([0-9]{1,3})
((DCI)|(dci))
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(([A-Z0-9]{1,3}))(\/)(([A-Z0-9]{1,2}))(-)(\d+)
((sota)|(SOTA)|(SUMMIT)|(summit))