MEGAN UE - SampleViewer does not show metadata, bugs


I am trying out MEGAN Ultimate Edition with the command line mode.
I have created from multiple samples a megan file with metadata.

/Applications/MEGAN-UE/tools/compute-comparison -i ../data/diamond-alignment-archives-meganized -o ../data/comparison.megan --normalize true --metaDataFile ../data/metadata.tsv.txt --ignoreUnassignedReads false --verbose

When opening the megan file in the MEGAN UE GUI, the metadata is shown in the SampleViewer.
But, when I open and show the SampleViewer with commands in commandline mode, the SampleViewer is empty.
Also there are bugs in the SampleViewer component, because coloring by an attribute with 3 distinct values results in samples colored only by 2 instead of 3 colors.

My metadata file is simple a tab separated values file. The header has a column “#SampleID”, some column headers have a ‘’ in the text. The text contains letters, numbers, ‘-’, '’, ‘(’, ‘)’ and ’ '. e.g.

#SampleID	Sample	Col_3	Col4
Sample-A01_1	A01	aaaa B	dddd (p t)
Sample-A02_1	A02	aaaa B	e (rrrrr cccc)
Sample-A03_1	A03	xxxx Z	dddd (p t)
Sample-A04_1	A04	xxxx Z	e (rrrrr cccc)
Sample-A05_1	A05	aaaa Z	dddd (p t)
Sample-A06_1	A06	aaaa Z	e (rrrrr cccc)

Simple commands ‘megan-cmd.txt’ I run to show the sample viewer:

new document;
open file='/Users/user/data/comparison.megan'
show window=samplesViewer;

I run the ‘megan-cmd.txt’ megan command with:

/Applications/MEGAN-UE/ -g -E < ./megan-cmd.txt

The log output does not show an error, but just a warning about some “embedded input file” not found.

Version   MEGAN Ultimate Edition (version 6.24.11, built 1 Dec 2022)
Author(s) Daniel H. Huson
Copyright (C) 2022 Daniel H. Huson. This program comes with ABSOLUTELY NO WARRANTY.
Java version:

License Type: Trial Name: xxxx
Executing: version;
Opening startup files
Open startup files: 
Loading 2,396,736
Loading ncbi.tre
Loading ncbi.tre: 2,396,740
updating viewer
MEGAN> Command: new document;
Executing: new document;
Executing: ;
MEGAN> Command: open file='/Users/user/data/.megan'
Executing: open file='/Users/user/data/comparison.megan';
Warning: Merged file: embbedded input files not found
Info: Opened file 'comparison.megan' with 6,464,328 reads
Executing: update;
updating viewer
MEGAN> Command: show window=samplesViewer;
Executing: show window=samplesViewer;

As you can see, not even the list of samples are shown to the left on the SampleViewer.

It is also strange, that if I click on import metadata, all txt files are sometimes disabled for selection, so I cannot chose them. But sometimes I can, when I use the GUI after restarting MEGAN.

When I want to color samples by an attribute in the GUI directly (not commandline), the coloring is also done incorrectly. If there are 3 distinct values for an attribute, MEGAN uses only 2 colors.