Copy-paste of the patterns between the files does not work reliably. Sometimes "Paste" button is greyed out. Sometimes "Ctrl+V" works only for the second time. Sometimes deletion of the last element in the files is not applied.
Sometimes sequence diagram is not created while the syntax of it is valid. Only the reboot of the dlt-viewer helps to get out of that situation.
Sometimes, if the search range is set before the indexing of the file is over, the search range feature is totally broken until a reboot of the dlt-viewer.
In the case of multiple HU-s declared and some of them not connecting ( only 1 connected ) - the search gets interrupted frequently.