diff --git a/copyparty/authsrv.py b/copyparty/authsrv.py
index a332e3f9..a863cf67 100644
--- a/copyparty/authsrv.py
+++ b/copyparty/authsrv.py
@@ -12,7 +12,7 @@ import threading
 import time
 from datetime import datetime
 
-from .__init__ import ANYWIN, E, TYPE_CHECKING, WINDOWS
+from .__init__ import ANYWIN, TYPE_CHECKING, WINDOWS, E
 from .bos import bos
 from .cfg import flagdescs, permdescs, vf_bmap, vf_cmap, vf_vmap
 from .pwhash import PWHash
diff --git a/copyparty/httpsrv.py b/copyparty/httpsrv.py
index dbfa17a8..286e9461 100644
--- a/copyparty/httpsrv.py
+++ b/copyparty/httpsrv.py
@@ -170,7 +170,7 @@ class HttpSrv(object):
             if self.args.log_thrs:
                 start_log_thrs(self.log, self.args.log_thrs, nid)
 
-        self.th_cfg: dict[str, Any] = {}
+        self.th_cfg: dict[str, set[str]] = {}
         Daemon(self.post_init, "hsrv-init2")
 
     def post_init(self) -> None:
diff --git a/copyparty/smbd.py b/copyparty/smbd.py
index c4a3b8ed..fb1192ad 100644
--- a/copyparty/smbd.py
+++ b/copyparty/smbd.py
@@ -162,6 +162,7 @@ class SMB(object):
                 if "connData" in cl:
                     return cl["connData"]["partygoer"]
                 cf = cf.f_back
+            raise Exception()
         except:
             warning(
                 "nyoron... %s <<-- %s <<-- %s <<-- %s",
diff --git a/copyparty/th_cli.py b/copyparty/th_cli.py
index e0b7b144..296527f4 100644
--- a/copyparty/th_cli.py
+++ b/copyparty/th_cli.py
@@ -31,7 +31,7 @@ class ThumbCli(object):
             if not c:
                 raise Exception()
         except:
-            c = {k: {} for k in ["thumbable", "pil", "vips", "ffi", "ffv", "ffa"]}
+            c = {k: set() for k in ["thumbable", "pil", "vips", "ffi", "ffv", "ffa"]}
 
         self.thumbable = c["thumbable"]
         self.fmt_pil = c["pil"]
@@ -94,7 +94,7 @@ class ThumbCli(object):
             self.log("no histpath for [{}]".format(ptop))
             return None
 
-        tpath = thumb_path(histpath, rem, mtime, fmt)
+        tpath = thumb_path(histpath, rem, mtime, fmt, self.fmt_ffa)
         tpaths = [tpath]
         if fmt == "w":
             # also check for jpg (maybe webp is unavailable)
diff --git a/copyparty/th_srv.py b/copyparty/th_srv.py
index 13f7338d..230fb2be 100644
--- a/copyparty/th_srv.py
+++ b/copyparty/th_srv.py
@@ -79,7 +79,7 @@ except:
     HAVE_VIPS = False
 
 
-def thumb_path(histpath: str, rem: str, mtime: float, fmt: str) -> str:
+def thumb_path(histpath: str, rem: str, mtime: float, fmt: str, ffa: set[str]) -> str:
     # base16 = 16 = 256
     # b64-lc = 38 = 1444
     # base64 = 64 = 4096
@@ -87,6 +87,11 @@ def thumb_path(histpath: str, rem: str, mtime: float, fmt: str) -> str:
     if not rd:
         rd = "\ntop"
 
+    # spectrograms are never cropped; strip fullsize flag
+    ext = rem.split(".")[-1].lower()
+    if ext in ffa and fmt in ("wf", "jf"):
+        fmt = fmt[:1]
+
     rd += "\n" + fmt
     h = hashlib.sha512(afsenc(rd)).digest()
     b64 = base64.urlsafe_b64encode(h).decode("ascii")[:24]
@@ -195,7 +200,7 @@ class ThumbSrv(object):
             self.log("no histpath for [{}]".format(ptop))
             return None
 
-        tpath = thumb_path(histpath, rem, mtime, fmt)
+        tpath = thumb_path(histpath, rem, mtime, fmt, self.fmt_ffa)
         abspath = os.path.join(ptop, rem)
         cond = threading.Condition(self.mutex)
         do_conv = False