I had similar issues when I used 0.7 and 0.7.1.
Since upgrade to 0.7.2 such session issues didn't happen anymore. At least the session errors "no valid session" shown on the browser disappeared since the upgrade, didn't activate session logs.

On Thu, Apr 19, 2012 at 5:09 PM, Thiago Cavalcante <tlcavalcante@gmail.com> wrote:
Dear,

We are the institution of the Brazilian government using the RoundCube
0.7 approximately one hundred concurrent users, aborting every minute
session. seek solutions RoundCube official site and Google but nothing
solved.

Structure:
Dovecot + Postfix (Debian Squeezy)
Lamp (CentOS 6)

log file: log/session
[19-Apr-2012 11:00:41 -0300]: Aborted session
kk6eq9drupq1uftma1iklqupj3; no valid session data found
[19-Apr-2012 11:01:09 -0300]: Aborted session
4fmv55epoe5a7q6sk1av1sivs6; no valid session data found
[19-Apr-2012 11:01:13 -0300]: Aborted session
4fmv55epoe5a7q6sk1av1sivs6; no valid session data found
[19-Apr-2012 11:01:14 -0300]: Aborted session
4fmv55epoe5a7q6sk1av1sivs6; no valid session data found
[19-Apr-2012 11:01:15 -0300]: Aborted session
4fmv55epoe5a7q6sk1av1sivs6; no valid session data found
[19-Apr-2012 11:01:15 -0300]: Aborted session
4fmv55epoe5a7q6sk1av1sivs6; no valid session data found
[19-Apr-2012 11:01:16 -0300]: Aborted session
4fmv55epoe5a7q6sk1av1sivs6; no valid session data found
[19-Apr-2012 11:02:47 -0300]: Aborted session
ireva72c6q5eo8bhv1o48069d2; no valid session data found
[19-Apr-2012 11:03:11 -0300]: Aborted session
ireva72c6q5eo8bhv1o48069d2; no valid session data found
[19-Apr-2012 11:04:53 -0300]: Aborted session
4ltsphcu62f8clnvnq5i6p92b7; no valid session data found
[19-Apr-2012 11:04:54 -0300]: Aborted session
li08lngnriaoqih2c79gfd2mc6; no valid session data found
[19-Apr-2012 11:04:56 -0300]: Aborted session
li08lngnriaoqih2c79gfd2mc6; no valid session data found
[19-Apr-2012 11:05:58 -0300]: Aborted session
3dp5gemf18ojlhrnt6iicp7mh3; no valid session data found
[19-Apr-2012 11:06:13 -0300]: Aborted session
3dp5gemf18ojlhrnt6iicp7mh3; no valid session data found
[19-Apr-2012 11:06:28 -0300]: Aborted session
3dp5gemf18ojlhrnt6iicp7mh3; no valid session data found
[19-Apr-2012 11:06:42 -0300]: Aborted session
3dp5gemf18ojlhrnt6iicp7mh3; no valid session data found
[19-Apr-2012 11:09:34 -0300]: Aborted session
3dp5gemf18ojlhrnt6iicp7mh3; no valid session data found
[19-Apr-2012 11:09:51 -0300]: Aborted session
ajjafc24h4k1lo26speq83j0h5; no valid session data found
[19-Apr-2012 11:09:52 -0300]: Aborted session
3dp5gemf18ojlhrnt6iicp7mh3; no valid session data found
[19-Apr-2012 11:09:59 -0300]: Aborted session
a8oiqhi11305hvqet45g7e4c24; no valid session data found
[19-Apr-2012 11:09:54 -0300]: Aborted session
of7pt0vfesi3keq3fuaojr21a1; no valid session data found
[19-Apr-2012 11:10:01 -0300]: Aborted session
b1j5amafkjhatnj67iu2teo8d2; no valid session data found
[19-Apr-2012 11:10:42 -0300]: Aborted session
b1j5amafkjhatnj67iu2teo8d2; no valid session data found
[19-Apr-2012 11:10:52 -0300]: Aborted session
b1j5amafkjhatnj67iu2teo8d2; no valid session data found
[19-Apr-2012 11:11:45 -0300]: Aborted session
f4r8jsvaaj2cc70l8190vdosf5; no valid session data found
[19-Apr-2012 11:11:57 -0300]: Aborted session
f4r8jsvaaj2cc70l8190vdosf5; no valid session data found
[19-Apr-2012 11:12:14 -0300]: Aborted session
3dp5gemf18ojlhrnt6iicp7mh3; no valid session data found
[19-Apr-2012 11:12:18 -0300]: Aborted session
f4r8jsvaaj2cc70l8190vdosf5; no valid session data found
[19-Apr-2012 11:12:37 -0300]: Aborted session
f4r8jsvaaj2cc70l8190vdosf5; no valid session data found
[19-Apr-2012 11:13:56 -0300]: Aborted session
c27t496q0lrvf22k0lv05idrd2; no valid session data found
[19-Apr-2012 11:15:01 -0300]: Aborted session
pqfaemfc00l5oomgp2cg1i1g37; no valid session data found
[19-Apr-2012 11:25:23 -0300]: Aborted session
jhu2ejt01dnp8hb8uvno1312c7; no valid session data found
[19-Apr-2012 11:26:03 -0300]: Aborted session
jhu2ejt01dnp8hb8uvno1312c7; no valid session data found
[19-Apr-2012 11:26:11 -0300]: Aborted session
jhu2ejt01dnp8hb8uvno1312c7; no valid session data found
[19-Apr-2012 11:26:27 -0300]: Aborted session
jhu2ejt01dnp8hb8uvno1312c7; no valid session data found
[19-Apr-2012 11:26:45 -0300]: Aborted session
jhu2ejt01dnp8hb8uvno1312c7; no valid session data found
[19-Apr-2012 11:27:51 -0300]: Aborted session
jhu2ejt01dnp8hb8uvno1312c7; no valid session data found
[19-Apr-2012 11:34:55 -0300]: Aborted session
4tnnn3131gue5e49b8cfpm6dt0; no valid session data found
[19-Apr-2012 11:40:00 -0300]: Aborted session
ggilpr3tfhfkei0m26aqebjj72; no valid session data found
[19-Apr-2012 11:42:57 -0300]: Aborted session
4quk1jscghifm03li05a0k8mb6; no valid session data found
[19-Apr-2012 11:43:01 -0300]: Aborted session
4quk1jscghifm03li05a0k8mb6; no valid session data found
[19-Apr-2012 11:44:52 -0300]: Aborted session
j5kgrhvd9opu98rb15vt246j11; no valid session data found
[19-Apr-2012 11:44:54 -0300]: Aborted session
7j2n89i55c9f34u5d30o49jt14; no valid session data found
[19-Apr-2012 11:44:56 -0300]: Aborted session
7j2n89i55c9f34u5d30o49jt14; no valid session data found
[19-Apr-2012 11:47:08 -0300]: Aborted session
da8f676nuifs82332n8ibfmec4; no valid session data found

Thank you,
Thiago Cavalcante
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