IGV 2.19.7 failed to display certain sequences in a genome fasta file

[santataRU]

Dear IGV developers,

I am using IGV 2.19.7 on macOS (ARM64) and have encountered an issue where IGV fails to display certain sequences from a genome FASTA file. I have uploaded a screen capture video, the IGV log file, and the relevant FASTA files to this link for reproducing the issue: https://drive.google.com/drive/folders/1_VXuKDI9-0DhzBNgnYL5NZfEjLF6Wjkn?usp=sharing.

Could you please let me know if this is a bug?

Thank you,

Xiao

[jrobinso]

You fasta file needs a line feed at the end of the last line. This might be a bug, I'm not sure, but adding a line feed to the last line seems to fix it.

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On Wed, Dec 10, 2025 at 7:43 AM xlei ***@***.***> wrote: *santataRU* created an issue (igvteam/igv#1787) <#1787> Dear IGV developers, I am using IGV 2.19.7 on macOS (ARM64) and have encountered an issue where IGV fails to display certain sequences from a genome FASTA file. I have uploaded a screen capture video, the IGV log file, and the relevant FASTA files to this link for reproducing the issue: https://drive.google.com/drive/folders/1_VXuKDI9-0DhzBNgnYL5NZfEjLF6Wjkn?usp=sharing . Could you please let me know if this is a bug? Thank you, Xiao — Reply to this email directly, view it on GitHub <#1787>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAHD2HEEWEGVVTFVU52U7434BA5RBAVCNFSM6AAAAACOUFV5SWVHI2DSMVQWIX3LMV43ASLTON2WKOZTG4YTKNZVGMYDMOI> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[santataRU]

Thanks! Yes, adding a line feed works! It is weird because my other file (U2_293T.fa) doesn't have the line feed, yet it also works.