Created attachment 179684 [details]
shows problems listed above

SUMMARY
1. X axis labels offset when using  Index at 10 Hz and manually setting start date/time 
    see attached screenshot of 24 hours of data, but X axis labels should be 0 hours at left margin, not 4 ticks in

2. date/time of individual plots start at 04:00 when data starts at 00:00


STEPS TO REPRODUCE
1. use data wizard to load very large .csv file, in my case it was 864,000 sets of I/Q data
2. setup time  manually, to be index at a  rate of 10 Hz, with a manually entered start date/time
3. plot I and Q

OBSERVED RESULT
as shown in attached plot.png screenshot



EXPECTED RESULT
not what I got

SOFTWARE/OS VERSIONS
Linux Mint 22
KST from repository


ADDITIONAL INFORMATION

Woops, it appears I can only attach one file. please contact me with instructions for adding two more files; an 
additional  screenshot, and one 6.6 MB .csv file
Thank you for all your time and energy on this fine product.
Regards, Rod