In each case, after running t0 and t8 in cuffcompare to generate a combined gtf I used that one to run cuffdiff. Everytime, the CDS files are empty and no p_ids can be found anywhere (in any of the gtf files). This is driving me mad!! I do not use a reference gtf for cufflinks (because that would restrict the analysis to known genes only) is that where I am going wrong? ON the other hand all the other things are filled out (e.g. splicing diff) and they seem - on the face of it - accurate.
Any ideas? Do you want access to my files?
After writing you back yesterday, I reran some Cufflinks and Cuffcompare analyses to see if I could generate a GTF file with both tss_id and p_id. Like you, I've had no luck.
I expect this is a bug in Cuffcompare and something that Adam can best address. Have you heard back from him? Looking on seqanswers, there's an open but old thread asking for a fix; I've bumped it in hopes of getting a response.