diff --git a/copyparty/util.py b/copyparty/util.py
index 49a279fa..c2d981d2 100644
--- a/copyparty/util.py
+++ b/copyparty/util.py
@@ -643,6 +643,9 @@ class HMaccas(object):
         try:
             return self.cache[msg]
         except:
+            if len(self.cache) > 9000:
+                self.cache = {}
+
             zb = hmac.new(self.key, msg, hashlib.sha512).digest()
             zs = base64.urlsafe_b64encode(zb)[: self.retlen].decode("utf-8")
             self.cache[msg] = zs
diff --git a/copyparty/web/browser.js b/copyparty/web/browser.js
index 61487a79..4ea36482 100644
--- a/copyparty/web/browser.js
+++ b/copyparty/web/browser.js
@@ -4658,7 +4658,7 @@ var treectl = (function () {
 	setwrap(bcfg_bind(r, 'wtree', 'wraptree', true, setwrap));
 	setwrap(bcfg_bind(r, 'parpane', 'parpane', true, onscroll));
 	bcfg_bind(r, 'htree', 'hovertree', false, reload_tree);
-	bcfg_bind(r, 'ask', 'bd_ask', false);
+	bcfg_bind(r, 'ask', 'bd_ask', MOBILE);
 	ebi('bd_lim').value = r.lim = icfg_get('bd_lim');
 	ebi('bd_lim').oninput = function (e) {
 		var n = parseInt(this.value);