Did you master it as an AUDIO CD ?
If you DID set it out as an Audio CD project, was it Disc-At-Once or Track-At-Once.
If you use track at once, you are forced to have track gaps, but can add tracks in several stages - but not play until you finalize.
Finally, most standard CD players will not recognize CD-RW media (unless they have that as an advertised feature), and may be somewhat iffy with CD-R media.
The advice used to be to write at a low speed, even 1x, but current drives and media are just not tuned for those speeds.
With a drive and media rated for 32x or above, I'd suggest no higher than 16x, and no lower than 4x - if drive and media are of lower specification, then I'd definitely favour 4x.
(personally, I just had great success with a very fussy player, using some OLD media at 2x - though this media dates back to when 12x would be considered FAST!) - I've used it with tolerable error levels at speeds up to 12x, but it clearly makes a better burn at 2x - Fornet media - not the best quality).