Has anyone really figured out what triggers them?  Not that it really matters but it's something I haven't been able to pin down.   I thought I might get some insight with the following but no luck.

Hardball Dynasty – Fantasy Baseball Sim Games - Player Profile: Don Li  Bump
Hardball Dynasty – Fantasy Baseball Sim Games - Player Profile: Javy Gutierrez
Hardball Dynasty – Fantasy Baseball Sim Games - Player Profile: Randy Gagne  Bump
Hardball Dynasty – Fantasy Baseball Sim Games - Player Profile: Ty Bagley
Hardball Dynasty – Fantasy Baseball Sim Games - Player Profile: Andres Melendez Bump

ST stats:

Don Li *	3	3	0	0	0	1	0	0	13.2	16	7	7	3	8	9	.291	.391	.491	1.76	4.61
Randy Gagne *	3	3	0	0	1	1	0	0	13.0	17	8	6	2	4	8	.315	.373	.444	1.62	4.15
Andres Melendez *	3	3	0	0	0	1	0	0	13.0	15	6	6	3	5	17	.294	.368	.529	1.54	4.15

Ty Bagley *	3	3	0	0	2	1	0	0	18.0	17	5	5	2	0	14	.254	.250	.433	0.94	2.50
Javy Gutierrez *	3	3	0	0	0	2	0	0	14.0	16	9	9	2	5	12	.281	.359	.439	1.50	5.79

Regular season stats:

Randy Gagne	4	4	0	0	1	2	0	0	28.0	20	8	8	2	6	23	.192	.236	.250	0.93	2.57
Don Li	4	4	0	0	2	2	0	0	27.0	32	11	10	2	10	24	.283	.347	.363	1.56	3.33
Javy Gutierrez	4	4	0	0	0	3	0	0	26.0	28	15	14	3	8	23	.259	.316	.407	1.38	4.85
Ty Bagley	4	4	0	0	1	2	0	0	23.0	27	16	13	4	10	25	.290	.356	.452	1.61	5.09
Andres Melendez	3	3	0	0	1	2	0	0	16.0	14	7	5	2	4	13	.241	.302	.362	1.13	2.81

There is just no rhyme nor reason to those three getting the bump and the other two failing to get one(although both are likely to get it in the next day or two).

AB's or innings pitched? 

Gagne and Gutierrez have the most.   Melendez has the least.    

i thought it was more like a rolling number. so if a hitter is an 80 he will move up the scale to 81 lets say 80.1 80.2 80.3 and so on. i will confirm from a dev chat as that is where i think i saw it.

so you wont see the bump until the player rating is rolled to the next number.

Unless I'm missing it, Hardball Dynasty – Fantasy Baseball Sim Games - Player Profile: Andres Melendez didn't improve in anything with his RS bump.

Did you ever consider that some things may be better left unknown?

If I were a cat, I wouldn't be as curious. 

I think that people should stop calling them "bumps". I consider them to be more "ratings updates", which may or may not reflect a bump in ratings.

I highly doubt that the bump happens the minute that the ratings are posted to the player card. In reality, they're maintained behind the scenes, and only displayed to the user when a "ratings update" occurs.

But your point is well taken.. why are some players given "updates" when others are not?

Bagley is the only one lacking now.   He has the lowest make-up and a missing tooth.