When trying to decrypt a message on a linuxmint system (17 qiana), after
entering the message and entering the passphrase afterwards gpg hangs:

EXAMPLE 1

$ gpg
gpg: Go ahead and type your message ...
-----BEGIN PGP MESSAGE-----
Version: BCPG v1.46

hQEMA7a1bZ0tb4dbAQf/ZA0HAg/Bmr2Kq1LDSplZdua3yetljID/ahMbf5kSt4xd
KiE69zhUQKpKl1FYgd+cNF6WJ1yPBmB1VoDVMaeuH7QIjdEXH2YES/tJCgLwyZGA
aK7sdMSddttRaHmxfsm3zHeKVBkj0aNCWqp9i7J5L0nvp8lMmtLJaMtZkOwv/Xji
8XA08Z6egQ8u+V/XbDuKnNNO13zu8nq2WbmqrzDsL0E4nVOj2Bxc7oap8aiqAcv9
lc3mhXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX7XD7thSHwp9yTuAKTQpiJhTM
jTkNnhqdVsEVkzad3VkIA8teo5eZjtW2CrKNkOzcLtJKAXs5ScWFfvDqLcXDZUCn
bltmtBlu2wlke+GBSQwJy3uhlefWqcL6vSwnwtSiQ1h9LibJdbh74xeUUQAVipZ+
NkOHP70D8u8VH40=

1LMh

-----END PGP MESSAGE-----

You need a passphrase to unlock the secret key for
user: "XXXXX XXXXXXXX <XXXXX.XXXXXXXX@gmx.at>"
2048-bit RSA key, ID 2D6F875B, created 2013-09-03

can't connect to `/run/user/1000/keyring-frTBLA/gpg': No such file or directory
gpg: can't connect to `/run/user/1000/keyring-frTBLA/gpg': connect failed
gpg: encrypted with 2048-bit RSA key, ID 2D6F875B, created 2013-09-03

      "XXXXX XXXXXXXX <XXXXX.XXXXXXXX@gmx.at>"

[waits for input]

EXAMPLE 2

$ GPG_AGENT_INFO="" gpg -d
-----BEGIN PGP MESSAGE-----
Version: BCPG v1.46

hQEMA7a1bZ0tb4dbAQf/ZA0HAg/Bmr2Kq1LDSplZdua3yetljID/ahMbf5kSt4xd
KiE69zhUQKpKl1FYgd+cNF6WJ1yPBmB1VoDVMaeuH7QIjdEXH2YES/tJCgLwyZGA
aK7sdMSddttRaHmxfsm3zHeKVBkj0aNCWqp9i7J5L0nvp8lMmtLJaMtZkOwv/Xji
8XA08Z6egQ8u+V/XbDuKnNNO13zu8nq2WbmqrzDsL0E4nVOj2Bxc7oap8aiqAcv9
lc3mhXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX7XD7thSHwp9yTuAKTQpiJhTM
jTkNnhqdVsEVkzad3VkIA8teo5eZjtW2CrKNkOzcLtJKAXs5ScWFfvDqLcXDZUCn
bltmtBlu2wlke+GBSQwJy3uhlefWqcL6vSwnwtSiQ1h9LibJdbh74xeUUQAVipZ+
NkOHP70D8u8VH40=

1LMh

-----END PGP MESSAGE-----

You need a passphrase to unlock the secret key for
user: "XXXXX XXXXXXXX <XXXXX.XXXXXXXX@gmx.at>"
2048-bit RSA key, ID 2D6F875B, created 2013-09-03

gpg: gpg-agent is not available in this session
gpg: encrypted with 2048-bit RSA key, ID 2D6F875B, created 2013-09-03

      "XXXXX XXXXXXXX <XXXXX.XXXXXXXX@gmx.at>"

[waits for input]

EXAMPLE 3

$ strace gpg
[...]
write(7, "Enter passphrase: ", 18Enter passphrase: ) = 18
read(7, "o", 1) = 1
read(7, "w", 1) = 1
read(7, "T", 1) = 1
read(7, "S", 1) = 1
read(7, "r", 1) = 1
read(7, "e", 1) = 1
read(7, "z", 1) = 1
read(7, "+", 1) = 1
read(7, "P", 1) = 1
read(7, "Y", 1) = 1
read(7, "q", 1) = 1
read(7, "0", 1) = 1
read(7, "\n", 1) = 1
ioctl(7, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, {B38400
opost isig icanon -echo ...}) = 0
ioctl(7, SNDCTL_TMR_CONTINUE or SNDRV_TIMER_IOCTL_GPARAMS or TCSETSF, {B38400
opost isig icanon echo ...}) = 0
ioctl(7, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, {B38400
opost isig icanon echo ...}) = 0
) = 20 \r", 20
getrusage(RUSAGE_SELF, {ru_utime={0, 3062}, ru_stime={0, 5610}, ...}) = 0
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, {0, 8691288}) = 0
getrusage(RUSAGE_SELF, {ru_utime={0, 4408}, ru_stime={0, 5610}, ...}) = 0
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, {0, 9987615}) = 0
getrusage(RUSAGE_SELF, {ru_utime={0, 4467}, ru_stime={0, 5610}, ...}) = 0
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, {0, 10095119}) = 0
open("/home/fs/.gnupg/random_seed", O_RDONLY) = 8
fcntl(8, F_SETLK, {type=F_RDLCK, whence=SEEK_SET, start=0, len=0}) = 0
fstat(8, {st_mode=S_IFREG|0600, st_size=600, ...}) = 0
read(8, "t\3t\21\7\\\225\\\1\365b D\27o\260\350(7\303\251\3670j5PBm9Ek\226"...,

600. = 600

close(8) = 0
getpid() = 6426
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, {0, 10248543}) = 0
open("/dev/urandom", O_RDONLY) = 8
fstat(8, {st_mode=S_IFCHR|0666, st_rdev=makedev(1, 9), ...}) = 0
select(9, [8], NULL, NULL, {3, 0}) = 1 (in [8], left {2, 999998})
read(8, "\3o4\3534\210\363\276\24\30\30\314/\317\333\302", 16) = 16
getrusage(RUSAGE_SELF, {ru_utime={0, 4568}, ru_stime={0, 5747}, ...}) = 0
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, {0, 10326967}) = 0
lseek(6, 0, SEEK_SET) = 0
read(6,
"\231\1\r\4R&B\33\1\10\0\301\240\242\23\16`\36\17;\376>\321\200\246\303\350\255\331\355\312\27"...,

8192. = 8192

getrusage(RUSAGE_SELF, {ru_utime={0, 21014}, ru_stime={0, 5747}, ...}) = 0
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, {0, 26621368}) = 0
lseek(5, 0, SEEK_SET) = 0
lseek(5, 0, SEEK_SET) = 0
read(5,
"\231\1\r\4R&B\33\1\10\0\301\240\242\23\16`\36\17;\376>\321\200\246\303\350\255\331\355\312\27"...,

8192. = 8192

getrusage(RUSAGE_SELF, {ru_utime={0, 21014}, ru_stime={0, 5747}, ...}) = 0
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, {0, 26720650}) = 0
write(2, "gpg: ", 5gpg: ) = 5
write(2, "encrypted with 2048-bit RSA key,"..., 65encrypted with 2048-bit RSA
key, ID 2D6F875B, created 2013-09-03
) = 65
write(2, " \"XXXXX XXXXXXXX <XXXXX.XXX"..., 47 "XXXXX XXXXXXXX
<XXXXX.XXXXXXXX@gmx.at>"
) = 47
getrusage(RUSAGE_SELF, {ru_utime={0, 21133}, ru_stime={0, 5747}, ...}) = 0
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, {0, 26833646}) = 0
getrusage(RUSAGE_SELF, {ru_utime={0, 21133}, ru_stime={0, 5747}, ...}) = 0
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, {0, 26848380}) = 0
read(0,

[waits for input]

If I press Ctrl + D it ends with the following message:
gpg: NOTE: sender requested "for-your-eyes-only"
gpg: data not saved; use option "--output" to save it

I've already found this, but it's without a solution:
http://lists.gnupg.org/pipermail/gnupg-users/2003-October/020555.html
Do you need more information?